[plugin] Decal Layer - v4

The feature is simple: VaM’s single decal slot has clear limitations, so I made this work as a layer-based decal system.

It was designed with scene distribution in mind.

The code related to splitting features into group tabs was referenced from moyashi post-processing plugin.

https://hub.virtamate.com/threads/post-processing.42942/

-update v2

added unique labels to each layer. These labels are also shown in the external storables, making them easier to control.

also added Fade In and Fade Out functions.

Textures and layers now require a double-click confirmation before they are deleted. After the first click, clicking the button again within 3 seconds will remove them.

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fix. 2026-06-04

Support for the BB Skin system included with the Airsoft Gun plugin has been added.

Both texture systems are now combined and rendered on a single texture layer.

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fix. 2026-06-11

Fixed an issue where the previous skin preset could be reapplied after changing the skin preset.

Now, when you change a Look, the newly selected skin textures are applied correctly, while your configured decal textures are preserved.

The integration with bb_skin has also been improved.bb_skin can now work through the BodyDecalLayerManager layer stack, or be switched back to its original standalone behavior if needed.