GAME: Make wheel genrim optional (genrim = false). Support custom tire/brake mesh.
GUI: Clean up, comment and optimize gui control loading.
GAME: Add Signal2, Slot2 classes. Use base class assignment operator. Add check for self assignment.
GUI: Preliminary GUI element list support(see SingleRace config file) which also required some refactoring. Only label list implemented atm.
Add missing header, update SConstruct.
GAME: Fix car not set on selection.
Merge branch 'master' of git://github.com/VDrift/vdrift