Move shader load code to shader.cpp instead of glwrap.hpp
Refactor library nodes to be proper TrackObjects, allows animating them with curves
Fixed some warnings printed when sfx are disabled.
Try to fix travis build.
Revert "Try to fix travis build."

This reverts commit 3ea954cc73eceb58d558c1e62ecb70267e8491eb.
Try to fix travis build.
Try to fix model loader hpp
merge