Huge rework started, capsule collision created and tested

My old collision system was too much. Too clunky, kind of buggy. I got
inspired by super smash bros's capsule collision system, and went off
and implemented it. Old code is moved into the scarapped folder, in case
anyone wants to browse, but for now, I'm back to square one. Game has
also been changed to side scrolling 2D, because making art for top down
is weird.