Quality Evaluation + Decompress

[ProbablePrime]

We wanted to test quality to evaluate what we should set our defaults to be.

This PR makes the changes required to achieve that.

1. Tests the marshaling of CMP_Texture
2. Add helper methods to copy commonly cloned details from one mip set to another, or from one texture to another
3. Tweak some of the marshaled pointers for easier Debug stepping
4. Expose CMP_MipSetToTexture from compressonator native
5. Expose/Hook up CMP_SaveTextureEx which takes a CMP_texture, this is different from CMP_SaveTexture that takes a mipset.
6. Using new functionality hookup decompression based tests
7. Introduce quality scoring tests, these, Load, Compress, Decompress, Save and then Score by comparing to the original. using Ssimulacra2.net
8. Introduce additional Snapshot tests that output PNGs. These are designed for human readable evaluation of formats/qualities.

WIP. Want more data.

[ProbablePrime]

Ok so Windows on my machine, GH Actions and Ubuntu generate all our test images, they all come out identically, they all come out with the same and expected quality scores.

This drastically improves our confidence in the library because... ITS REALLY WELL TESTED now.