implement FileAttributesTag
implement tag reading
implement MetadataTag
implement SetBackgroundColorTag
add ProductInfo tag type
add checks to verify that tags are properly read
implement ProductInfoTag
implement ScriptLimitsTag
implement EnableTelemetryTag
better support for malformed files
implement FrameLabelTag
simplify string reading
implement SymbolClassTag
implement ShowFrameTag and DoABCTag
implement DefineShapeTag
clean up file
implement changing NumFillBits and NumLineBits in StyleChangeRecord
implement DefineSpriteTag
implement EnableDebugger tags
implement PlaceObjectTag