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BGE Rasterizer methods to handle Screen Space - (getScreenPosition, getScreenVect, getScreenRay)

getScreenPosition(obj):
- Gets the position of an object projected on screen space.

getScreenVect(x, y):
- Gets the vector from the camera position in the screen coordinate direction.

getScreenRay(x, y, dist, property):
- Look towards a screen coordinate (x,y) and find first object hit within dist that matches prop.
- The ray is a call to KX_GameObject->rayCastTo from the KX_Camera object.

Patch [#18589] test files can be found there. Patch reviewed by Campbell