oxidize into v2.0

[elringus]

• Core logic rewritten in Rust w/o any dependencies on Unity and is now distributed as cross-engine native library with C ABI, as well as standalone CLI utility.
• Performance improved by ~3x.
• Content hashing is now more strict, which fixes rare issue when diced units with subtle differences were considered identical causing minor rendering artifacts.
• Unity integration has the same old GUI and serialized assets, but uses new native libraries under the hood. Windows x64, Linux x64 and Mac ARM binaries are bundled with the package.
• Added Separator option allowing to change the separator string used to join generated sprite names located in sub-folders.
• Improved compression ratio by always discarding transparent mesh quads. To preserve original sprite aspect ratio (eg, for animations), disable Trim Transparent. Disabling the option won't affect the compression ratio, but instead offset mesh vertices and sprite rect to keep the original aspect.
• Min. supported Unity version changed to 2022.3.
• Fixed #39

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (113726c) to head (c21b0f1). Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #40 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 20 18 -2 Lines 865 865 ========================================= Hits 865 865 ```

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