Fix some typos
Added support for "<" relations in graphical restrictions, fixed
compiler warnings.
When entering gp_name, display buttons vertically to allows gamepad selection
Fixed problem in dynamic ribbon widgets which contain animations, labels and more than one row.

Thanks to marcoll.
Merge pull request #1781 from thamlett/master

Fix some typos
Fix image format for bilateral blur
Try to fix ibl precision issue
Fixed minor memory leak.
Merge branch 'master' of github.com:supertuxkart/stk-code
Fixed memory leak.
Fixed memory leak.
Revert "Try to fix ibl precision issue"

This reverts commit 1cf592394bdf2e31996a8bc9aeb1da189455447b.
Fixed memory leaks.
Merge branch 'master' of github.com:supertuxkart/stk-code
Clean up sunlight shader + factorize diffusebrdf
Remove redondant uniform in IBL
Move FS template declaration in shaders.hpp
Factorise SH coefficient in an UBO
Remove extra uniforms in IBL shader
Fix memory leak.