Add possibility to turn off mip map

[tigrouind]

Textures dynamically switched from low to high resolution depending their distance (like the original game).

It would be great to be able to turn this off (high resolution textures are always used) because it's visually annoying and using high res textures has virtually no performance consequences on modern PCs. Adding a new setting in the CFG file is enough.

[wipeout-phantom-edition]

This is something that would likely require reimplementing the way the track is drawn. I will probably do that as part of a larger refactor of how geometry is processed for rendering so that it gets uploaded to the GPU in world space instead of doing camera transformation and projection on the CPU.

[tigrouind]

If it's too hard, forget about it. I thought that it would be something as simple as adding a flag to force renderer to use some given texture tile size but seems it's not. It's closed source so I had no idea how difficult it would be.