Rework build into a class

This simplifies usage, goes from

    build['flag']
to
    build.flag

Also makes static analyzers able to detect invalid attributes as the set
is now limited in the class definition.

As a bonus, setting of the default field values is now done in the
constructor, not separately and manually.

While at it, unify "build", "thisbuild", "info", "thisinfo", etc into
just "build".

tests/metadata/net.osmand.plus.pickle

@@ -10,87 +10,87 @@ S'Tracking'
 p5
 aS'NonFreeNet'
 p6
-asS'Web Site'
+asS'Litecoin'
 p7
-S'http://osmand.net'
+NsS'comments'
 p8
-sS'Auto Update Mode'
-p9
-S'None'
-p10
+(dp9
 sS'Provides'
-p11
+p10
 NsS'Issue Tracker'
-p12
+p11
 S'https://github.com/osmandapp/Osmand/issues'
-p13
+p12
 sS'Donate'
-p14
+p13
 S'https://code.google.com/p/osmand/#Please_support_the_project'
+p14
+sS'Archive Policy'
 p15
-sS'id'
+NsS'Description'
 p16
-S'net.osmand.plus'
-p17
-sS'Description'
-p18
-(lp19
+(lp17
 S"Osmand~'s features can be extended by enabling the plugins via the settings,"
-p20
+p18
 aS'which include online maps from many sources, tracking, OpenStreetMap (OSM) editing and'
-p21
+p19
 aS'accessibility enhancements.'
-p22
+p20
 aS''
-p23
+p21
 aS'Map data of both vector and raster types can be stored on the phone memory'
-p24
+p22
 aS'card for offline usage, and navigation by default uses offline methods. Map'
-p25
+p23
 aS'data packages for many territories can be downloaded from within the app and'
-p26
+p24
 aS'there is a desktop program available on the website as well for creating your'
-p27
+p25
 aS'own.'
-p28
-ag23
+p26
+ag21
 aS'Anti-Features: Tracking - It will send your device and application specs to an'
-p29
+p27
 aS'Analytics server upon downloading the list of maps you can download.'
-p30
-ag23
+p28
+ag21
 aS'[https://osmandapp.github.io/changes.html Changelog]'
-p31
+p29
 asS'Requires Root'
-p32
+p30
 I00
-sS'comments'
+sS'lastupdated'
+p31
+NsS'id'
+p32
+S'net.osmand.plus'
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-(dp34
-sS'Repo Type'
-p35
-S'git'
-p36
 sS'Repo'
-p37
+p34
 S'https://github.com/mvdan/OsmAnd-submodules'
-p38
+p35
 sS'No Source Since'
-p39
-g23
+p36
+g21
+sS'Repo Type'
+p37
+S'git'
+p38
 sS'Auto Name'
-p40
-g23
+p39
+g21
 sS'Categories'
-p41
-(lp42
-S'Navigation'
+p40
+(lp41
+S'None'
+p42
+aS'Navigation'
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 asS'Source Code'
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 S'https://github.com/osmandapp/Osmand'
 p45
-sS'Litecoin'
+sS'added'
 p46
 NsS'Update Check Ignore'
 p47
@@ -104,7 +104,7 @@ S'GPLv3'
 p51
 sS'Changelog'
 p52
-g23
+g21
 sS'Update Check Mode'
 p53
 S'None'
@@ -113,394 +113,344 @@ sS'Summary'
 p55
 S'Offline/online maps and navigation'
 p56
-sS'Maintainer Notes'
+sS'Current Version'
 p57
-(lp58
-S'No UCMs apply because git never contains actual releases, only pre-releses.'
+S'1.9.5'
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+sS'Maintainer Notes'
 p59
-ag23
-aS'The build instructions have been moved to a script in the root of the repo,'
-p60
-aS"'build'. This way it can be updated along with the submodules."
+(lp60
+S'No UCMs apply because git never contains actual releases, only pre-releses.'
 p61
-asS'Current Version Code'
+ag21
+aS'The build instructions have been moved to a script in the root of the repo,'
 p62
-S'197'
+aS"'build'. This way it can be updated along with the submodules."
 p63
-sS'Binaries'
+asS'Current Version Code'
 p64
-NsS'Archive Policy'
+S'197'
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-NsS'builds'
+sS'Binaries'
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-(lp67
-(dp68
+NsS'builds'
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+(dp69
 S'submodules'
-p69
-I01
-sS'vercode'
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-S'182'
+S'true'
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-sS'forceversion'
+sS'kivy'
 p72
 I00
-sS'oldsdkloc'
+sS'forceversion'
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 I00
-sS'gradleprops'
+sS'oldsdkloc'
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-(lp75
-sS'scanignore'
+I00
+sS'antcommands'
+p75
+NsS'scanignore'
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 (lp77
-sS'patch'
+sS'gradle'
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-(lp79
-sS'srclibs'
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-(lp81
-sS'output'
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-S'bin/OsmAnd-release-unsigned.apk'
-p83
-sS'encoding'
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-NsS'extlibs'
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-(lp86
-sS'init'
-p87
-g23
-sS'version'
-p88
-S'1.8.2'
-p89
-sS'build'
-p90
-S'./old-ndk-build.sh && ant -Dsdk.dir="$ANDROID_SDK" -Dndk.dir="$ANDROID_NDK" -DBLACKBERRY_BUILD=false -DBUILD_SUFFIX= -DAPK_NUMBER_VERSION=182 "-DFEATURES=+play_market +gps_status -parking_plugin -blackberry -amazon -route_nav" -DCLEAN_CPP=false -DPACKAGE_TO_BUILT=net.osmand.plus -DAPK_VERSION=1.8.2 -Dnet.osmand.plus= -Dbuild.version=1.8.2 -Dbuild.version.code=182 -Dnativeoff=false "-DversionFeatures=+play_market +gps_status -parking_plugin -blackberry -amazon -route_nav" clean release'
-p91
-sS'rm'
-p92
-(lp93
-sS'kivy'
-p94
 I00
+sS'srclibs'
+p79
+(lp80
+sS'encoding'
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+NsS'extlibs'
+p82
+(lp83
+sS'init'
+p84
+g21
+sS'version'
+p85
+S'1.8.2'
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 sS'subdir'
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+p87
 S'android/OsmAnd'
-p96
+p88
+sS'rm'
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+(lp90
+sS'build'
+p91
+S'./old-ndk-build.sh && ant -Dsdk.dir="$ANDROID_SDK" -Dndk.dir="$ANDROID_NDK" -DBLACKBERRY_BUILD=false -DBUILD_SUFFIX= -DAPK_NUMBER_VERSION=182 "-DFEATURES=+play_market +gps_status -parking_plugin -blackberry -amazon -route_nav" -DCLEAN_CPP=false -DPACKAGE_TO_BUILT=net.osmand.plus -DAPK_VERSION=1.8.2 -Dnet.osmand.plus= -Dbuild.version=1.8.2 -Dbuild.version.code=182 -Dnativeoff=false "-DversionFeatures=+play_market +gps_status -parking_plugin -blackberry -amazon -route_nav" clean release'
+p92
+sS'vercode'
+p93
+S'182'
+p94
 sS'forcevercode'
-p97
+p95
 I00
 sS'preassemble'
-p98
-(lp99
+p96
+(lp97
 sS'update'
-p100
-(lp101
-S'auto'
-p102
-asS'maven'
-p103
+p98
+NsS'maven'
+p99
 I00
 sS'disable'
-p104
-I00
-sS'ndk_path'
-p105
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-sS'scandelete'
-p106
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-sS'buildjni'
-p108
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-S'no'
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-asS'ndk'
-p111
-S'r10e'
-p112
-sS'target'
-p113
-NsS'type'
-p114
-S'raw'
-p115
-sS'antcommands'
-p116
-NsS'gradle'
-p117
-I00
-sS'prebuild'
-p118
-S'sed -i \'s/"OsmAnd+"/"OsmAnd~"/g\' build.xml'
-p119
-sS'novcheck'
-p120
+p100
 I00
 sS'commit'
-p121
+p101
 S'76ada6c8a08afe69acb755503373ac36328ef665'
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-sa(dp123
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-I01
-sg70
-S'183'
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+sS'scandelete'
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+(lp104
+sS'buildjni'
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+S'no'
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+p107
+NsS'target'
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+NsS'gradleprops'
+p109
+(lp110
+sS'patch'
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+(lp112
+sS'prebuild'
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+S'sed -i \'s/"OsmAnd+"/"OsmAnd~"/g\' build.xml'
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+sS'novcheck'
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+sS'output'
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+S'bin/OsmAnd-release-unsigned.apk'
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 I00
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-sS'build'
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-sS'commit'
-p174
-S'1.9.5'
-p175
+S'bin/OsmAnd-release-unsigned.apk'
+p167
 sasS'FlattrID'
-p176
+p168
 NsS'metadatapath'
-p177
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 S'metadata/net.osmand.plus.xml'
-p178
+p170
 sS'Disabled'
-p179
-NsS'added'
-p180
-NsS'lastupdated'
-p181
-NsS'Update Check Name'
-p182
+p171
+NsS'Web Site'
+p172
+S'http://osmand.net'
+p173
+sS'Update Check Name'
+p174
 NsS'Vercode Operation'
-p183
-NsS'Current Version'
-p184
-S'1.9.5'
-p185
-s.
+p175
+NsS'Auto Update Mode'
+p176
+S'None'
+p177
+s.