Minecraftforge: Biome tags are incomplete and erroneous

[Robijnvogel]

Mesa biomes aren't tagged as DRY:
https://github.com/MinecraftForge/MinecraftForge/blob/1.12.x/src/main/java/net/minecraftforge/common/BiomeDictionary.java#L446-L448

Mutated biomes are tagged as SAVANNA:
https://github.com/MinecraftForge/MinecraftForge/blob/1.12.x/src/main/java/net/minecraftforge/common/BiomeDictionary.java#L468-L470

And there are probably quite a few other issues with biome tags.

Would it be okay for me to assemble a small team to go over the list with tags and submit a pull-request?

[liach]

Yes, you should absolutely create a pull request.

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This issue has been automatically marked as stale because it has not had activity in a long time, and will be closed if no further activity occurs. If this issue was overlooked, forgotten, or should remain open for any other reason, please reply here to call attention to it and remove the stale status. Thank you for your contributions.

[liach]

@mezz Can you tag this one? I will work on this super easy one.

[Robijnvogel]

I've been meaning to really look into the list, since some other tags might be missing or incorrect as well, but I just have not gotten around to actually doing it.

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This issue has been automatically marked as stale because it has not had activity in a long time. If this issue is still relevant and should remain open, please reply with a short explanation (e.g. "I have checked the code and this issue is still relevant because ___." or "Here's a screenshot of this issue on the latest version"). Thank you for your contributions!

[dargonforce]

taking a look at this, gonna make a branch