GS/HW: Add all levels/unclamped mipmap modes

[stenzek]

Description of Changes

This PR brings back the mipmapping dropdown (oh noes), but it does not bring back basic (phew).

It adds two new modes:

All Levels

Instead of creating TC sources with LODs M..MXL, where M is the highest LOD from the vertex trace, it always uploads mip levels 0..MXL. This should have the result of producing fewer duplicate textures when dumping, and potentially increase TC efficiency, since there's less duplicates in the hash cache too.

Unclamped

This is a new, enhanced mode, that uses the full range of texture LODs that the game provides, but ignores the L/K values/game's bias. This results in higher-resolution textures being used when upscaling, and makes anisotropic filtering work again without requiring forced trilinear.

Rationale behind Changes

New enhancement for improved visuals in games, because forcing mipmapping everywhere was actually a visual regression in some cases.

Example: Burnout 3

Suggested Testing Steps

Experiment :-)