Plugins + Scripts CUA Surface Editor

- Added opacity slider for decals.
- Added Alternative Decal mode, use it if decals start bleeding caused by some UV maps (for example curtain by bqbq).
In this mode, multiple decals are still possible, but are forced to be either tiling or not tiling.

- New Decal System: Add multiple decals on your material slots of your CUA (all saved in presets). You can even export the final result canvas as PNG (credits to Chokaphi for his implementation in Decal maker).
- UI rework: Moved Universal preset buttons to the top, colored vamifier buttons, implemented intelligent hide and show feature system.
- More Control: Added rotation and scaling sliders. (Thanks to Bleaching_POV for the feedback).
- File browser remembers last texture location as quality of life feature.
- Added Subsurface and Specular color pickers.
- Color picker now remembers setting when hidden.
- Added Custom Gloss texture support.
- Added Emission support (requires Macgruber's Postmagic bloom effect). Credits to Blazedust.
- Fixed critical bug which deleted original diffuse map when toggling color.
- Added a experimental feature to fix prefab materials with missing backsides. (Thanks to ivam for the feedback)

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- Renamed universal presets to universal material preset. They now correctly apply to the currently selected material slot and can be used on every prefab.
- Saved presets will now appear instantly in save menu, no reload required.
- Plugin now correctly starts with collapsed texture tiles & offset menu.
- Potential fix for sometimes not registering first click on "Save prefabname preset" button.
- Removing the plugin now instantly loads the original state of the prefab (and removes unused plugin data).