- Removed TColor3, use sf::Color instead
- Introduced more C++11 features: Use constexpr and defaulted/deleted functions
- Made several member functions static or const
- Removed dead code
git-svn-id: https://svn.code.sf.net/p/extremetuxracer/code/trunk@631 0420edf4-82e4-42fc-9478-35b55e6d67a3