convert: started with converter of empire2_x1_p1.dat
convert:fixed uncompressing, extracts "header"
convert: reading TerrainRestOffsets, added class TerrainRestrictions

done with reading TerrainRestrictionOffsets (even though they probably
won't be used in the further converting)

TerrainRestrictions: Added the class to read and save that data
convert: a little cleanup of the code, seems to work at least a bit
convert: integrated gamedata converter into main script
convert: fixed offsets for gamedata reading
doc: gamedata structure documentation started
doc: replaced short with int16_t
doc: gamedata struct semicolons added
doc: gamedata struct finished
doc: gamedata char replaced by int8_t
convert: preparing for dat file reader generator
doc: added gamedata doc file
convert: gamedata struct sizes as suffix for variable name
doc: gamedata struct definition moved to doc folder
convert: gamedata empires2x1p1 class renamed
convert/gamedata: python module created
convert/gamedata: moved the main dat file decoder to subfolder
convert/gamedata: adapted testing invocation paths
convert/gamedata: showing original and decompressed size