The BIG COMMIT(tm)

The BIG COMMIT(tm)

This is it, expect a broken supertux I only fixed the most annoying issues so
far, lots more are still waiting in the TODO list, but I had to bring this stuff
to cvs sometime. Changes:

- Completely new collision detection scheme, which collides all objects with
  each other once per frame, instead of single objects manually testing for
  collisions
- New collision detection routines which support slopes and provide additional
  info on collisions: penetration depth, hit normal vector
- Lots of general cleanup/refactoring
- Splitted the monolithic badguy class and reimplemented most of them as single
  classes with a badguy base class.
- Splitted the monolithic Special class into several classes
- Rewrote the timer and all timing related stuff to work on float and seconds
  (not like the mixup before where you had frame_ratio, msecs and secs in
   different parts of the app)
- Support for unisolid tiles
- Created a flying platform prototype (doesn't work completely yet)
- rename InteractiveObjects to triggers and implemented a new sequence trigger,
  (only supported sequence is endsequence at the moment)
- transformed the bonusblocks and bricks into objects

SVN-Revision: 2115