Fixed missing Attribs flag from SetupDirs
Fixed old setup header reading code (wrong utility function and forgot import)
Implemented new GOG installer compatibility (InnoSetup 5.5.0u)
5.5.0u structure parser created by means of a code generator (Marpa grammar, generator and other structures will follow)
Improved LZMA decompressor
Fixed up existing code to support new enum/set symbol names (from original source code)
Some minor fixes/improvements