Rename to just Shear AND change render system approach. Details in comment

[zeroxthreef]

Decided that I want this to be more than a 2D game engine. Since this is going to be one of my few long term projects, I feel like more ambitious goals are acceptable.

Renderer ideas:

• PicoRenderer for absolute lowest end systems & for optional render backend for fun (<3 software rasterizers)
• BGFX for the default render backend. Runs on basically everything id want to target anyway

Another note to myself because i'll forget it