Makes datum materials support GAGS icons without too much configuration needed. You just need to specify a base config and subtype configurations can be for specific materials. I used the cleric mace as a testing item due to it having 2 distinct regions to color, so it got migrated to this system.
Moving forward we should not be using the regular color system for datum mat items as you can get conflicts with other code adding colors whereas with this the sprite has the base colors baked in.
Also I made the gold mace shimmer, for fun.
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