Fixes
- the dreadful "lost stream sync" error is gone
- shadows are rendered again if the floor is far away from the shadow caster
- some static meshes are invisible now as they are intended to
New Features
- water has a new specular component which makes it look a bit more "classic"
Improvements
- libsndfile has been completely removed and replaced with ffmpeg because of some issues with audio handling
- same with glew, which is replaced by glad now
- shader handling was a bit simplified