New tag/mech pair `foliage_color` (#2458)
* Add new tag/mech pair `foliage_color`
Tested on 1.17.1, 1.18.2, and 1.19.4
* Change wording of comment.
* Different way of setting and getting foliage color
Now, the foliage color is directly set instead of using a builder class.
Also, the foliage color is now approximated for all biomes without an already set foliage color.
* Meta and code cleanup
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commit: f223574)
