[Feature] Support for Polytone Colourmaps

[Strubbelkopp]

Relevant Minecraft versions and other mods/projects

No response

Description of the feature

Polytone allows you to define custom colourmaps and use them on any block. It would be nice, if you could use these in the tinting field in Fusion's texture types.

Use case

As shown in the screenshot I modified the colourmap for grass blocks, so when you add overlays, the colours don't match up anymore.

Example usages

In addition to the vanilla hardcoded ones, you could refer to the custom colourmaps by their id, like how they're used within Polytone itself:

{
  "fusion": {
    "type": "connecting",
    "layout": "horizontal",
    "render_type": "cutout",
    "tinting": "[namespace]:[colourmap name]"
  }
}

Additional context

No response