Added simple script that makes all challenges trivial
(0 laps, no time or energy limit).
Merge remote-tracking branch 'upstream/master'
Test commit.
Fixed format for TODO file.
More testing.
Use object_pass.vert for transparent objects.
Use explicit attribute location.

Should help implementing basevertex later, and simplify vao creation a
lot.
Some fixes
Simplify vao management for non instanced nodes.
Use UBO matrixes in displace.
Fixed typo in warning message.
Remove break at wrong position
Simplify code for checking best refresh rate on linux, which I added previously.
Fixed accidentaly noticed typo in comment
Merge branch 'master' of github.com:supertuxkart/stk-code
Merge branch 'master' of github.com:supertuxkart/stk-code
Adjust graphical offset by rotation to fix graphical position not exactly
the same as physicsl position when kart drives on wall.
Fixed --track command line option.
Fix for GL 3.1 context
Fixed compilation error