[easyNPC] First working language definition for easyNPC in antlr4
[easyNPC] Entire parsing designed to work with antlr parsing

The documentation is now not properly working anymore and needs to be
written again.
[Compiler] Added stain loading to compiler
[EasyNPC] Removed old parser classes
[easyNPC] Updated syntax display
Merge branch 'feature/antlr4' into develop