Bugfix 0.1.8

[Cidan]

Closes #125 #136 #173 #186 #179 #78 #146

This CL additionally completely rewrites the rendering engine in a few ways:

1. Rendering is now done in two phases, with a data sweep phase happening on one frame, and a draw phase happening on the frame immediately following the sweep phase.
2. The data sweep phase now only scans for changed items instead of sweeping all items.
3. The data render phase now correctly renders partial dirty items after the first full render.

All of this leads to an improvement of anywhere from 10x to 1000x in render times, as the bags now render linearly with the number of items that changed, instead of the number of items in your bag.