Revert "Removed obsolete and/or experimental classes, in particular the 2D rendering packages and related classes like sprite data files, parsers and processor classes. These are moved to the tetragon-obsolete repository (https://github.com/hexagonstar/tetragon-obsolete) because the 2d rendering system (which wasn't fully implemented) is being re-concepted and re-implemented. The removed classes are beinmg put on the obsolete repositiry as a back-reference for the new rendering system."

This reverts commit 743c4a3030d3e787c5a3077c71eaf1bb9eeb4617.
Removed experimental classes from dev branch.
recompiled dist package.