Attempt to make the data-field of cpBody work with racket objects.
Fixed missing defchipmunk syntax for cpveql and cpvadd.
Added all operators for cpVect and cpBody using API reference 6.1.2.
(http://chipmunk-physics.net/release/Chipmunk-6.x/Chipmunk-6.1.2-API-Reference/)
Removed some comments and line endings to make the code more overseeable.
Added templates for the operations of cpSpace.
Removed some comments in the cstruct definitions. They should be stored into a separate documentation file.
Added some documentation in a separate folder.