Update BUILDING.txt for latest version.
Merge pull request #99 from Hello71/building

Update BUILDING.txt for latest version.
cleanup and checks to avoid bad addresses

- removed obsolete name reads

#73 bad addresses:
- commented out unused prefix stuff in words
- checks for invalid materials before attempting to read
-
Mv etc -> share, use applicationDirPath (fixes #30)

Also build outside of bin.
Add DATADIR, search_paths for game_data.ini