Palette System - #37
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Adds an alternative system for coloring material shapes -- palettes. Original idea by @june_username in the GTNH discord.
A palette is a PNG for one or more materials, where each material has an index to some column of that PNG. A material indicates it uses a palette through a builder call, where it specifies the name of the palette and its column. Then, instead of tinting shapes, it will replace the grayscale pixels with colors from the palette (maintaining alpha from the original art). It does the replacement such that the palette column (descending) maps to the art pixels by HSV value (descending). That is, the top pixel in the column will replace the highest-value pixel, and the bottom the lowest. If there are less pixels in the column than differing HSV values, the bottom column pixel is repeatedly used as necessary.
The palette system still respects layers. The layers are flattened onto the base image before the palette is applied, blending (see
PaletteBaker#compositeOver) each layer. The overlay, similar to tint, remains uncolored.Example material added showing using a short palette column, and an animation.