Initial renderer optimizations

[gregtatum]

• [X] Cache and share shaders
• [ ] Draw opaque meshes (front to back?)
• [ ] Draw transparent meshes (back to front)
• [ ] Minimize state transitions with delta only gl calls

Then I'm sure there are a lot of others to look at.

I'm also wondering if I should sort by some kind of bitwise sort key, where each priority sorting could be its own set of bits. I think I need to study some other engines and see how they are handling these optimizations.