Move rust-sdl2 out of parent directory.
Store bat's origin separately from current x/y.
Adds player's damage rectangle & collision detection of any two rectangles.
Add yatty's collision rectangle; check if it intersects the players.

* Yatty's collision rectangle => x + 1/2 tile, y + 1/2 tile, w: 0, h: 0.
* (aka 1x1 @ yatty's center of x,y)
Merge branch 'feature/yatty-collision'