Mesa changes
Well, main part looks done. All parts of compiller, including code generation was rewriten. It compiles, but may not work as expected. I do not know, what is expected in some cases, so cannot guarantee that I understood the mad mind of 3D Labs. There are somemore work left:
1. Checking
2. Rewrite 2 more traversers as mesa visitor.
3. A lot of refactoring work, cleaning, dead code removing, etc.
4. Many cases has TODO and FIXME comments, it must be checked.