removed llvm dependency
system dependant ghc-options
started creating a GUI overlay image
Removed Data.Label from code and dependencies.
binary is symlink again
GUI data structure experiments
forgot to commit a file  (GUI data structure experiments)
Changed OpenGL-Lvl to 3.30 with Tessellation-Ext

- figured out how to enable extensions

refs #471 @1h
before merging with ui
Merge remote-tracking branch 'origin/ui' into tessallation
WIP-Commit. DOES NOT WORK.
still WIP.
works now again and we have a renderer