Silenced warnings about reference to stack object
Improved type conversion (doesn't depend on includes)
Explicit typecast overloading instead of converter function.
	I was not aware that typecasting could be overloaded...
Beginning of wrapping more cpSpace
Removed unnecessary getPtr in WrappingPtr
More wrapped cpSpace function. Callbacks will have to wait till I figure out a way to pass std::function to chipmunk.