Merged in collision optimisatin work where only moveable objects are …

…collided against immoveable objects

Merged in all the new collisionhandling work

Hilarious collision handling happening

Merged in scrolling stuff now it's working

Merged in collision handling branch because it's mostly working now

Merged in background code and scrolling code

Collision handling mostly working just need to get the precision bett…

…er so ball gets pushed out corrently

LLVM/Clang keeps inserting 'ud2' instructions in Level:initlise function

which I have no idea why... So leaving this here if I ever wanna find out

Merged in refactoring code to master

Merged in opengl2Sdl into master