Use AZDO techniques

[xycaleth]

http://www.slideshare.net/CassEveritt/approaching-zero-driver-overhead

Doing this should reduce the overhead of calling into the GL driver, and improve frame rates. This could be broken down into several steps:

• [ ] #45 Array textures / sparse textures
• [ ] #46 Vertex array objects per vertex format
• [ ] #47 Move more constants to uniform buffers (reduce glUniform* calls)
• [ ] #48 Multi draw indirect?