Lotsa shiet (desc.)

IShape for generic intersection tests.
OpenTK 1.1. (also in QuickFont).
Hat support for Input (will still not detect xbox360 dpad
(https://github.com/opentk/opentk/issues/64)).
Origin of a rectangle is now the offset of the top left corner to the
position (rotation happens around the position now).
Using a rectangle for sprite drawing, it was pretty much the same code
anyway.
Still no proper collision checks in PhysicalObjects, that's up next
probably...