Change the function to check for collision at the specified point.
This is much straightforward to use.
The offset point to check must be computed before passing into the
function.
Remove redundant position argument for the straightforward collision
functions, as the entity would have it alread.
The collision offset check function is not as trivial and requires
some review
Position is so commonly used that placing it into Entity from the
CTransform components reduces the reference to CTransform.
Void Particle proved that it made development much easier.
En Yi