clamping values to avoid pink specularity
Modified sources.cmake to trigger automatic run of cmake.
Merge branch 'master' of github.com:supertuxkart/stk-code
Switch to fast music immediatley on lastp lap, and not only
when 30 seconds are left.
Try to fix #1772

Avoid doing glViewport call in IBL.cpp since the result is not used
without dynamic light.
Do not use motion blur if no boost amount
Use deferred shading instead of light prepass
Implement DFG LUT for phong specular
Use GGX D + Schlick G for BSDF and burley for Diffuse