Object: Add rect + abs_rect and distance_to().
Object: Add rect + abs_rect and distance_to().

This is all we need in order to let one object follow another one
without clipping them together.

Also, this makes it way easier to do calculations based on Rect types,
which should make things such as a.x + a.width pretty unnecessary.

Signed-off-by: aszlig <ee1aa092358634f9c53f01b5a783726c9e21b35a@redmoonstudios.org>

aszlig/hase