Register planet biomes on preinit

[Caedis]

Fixes GTNewHorizons/GT-New-Horizons-Modpack#12500 (comment)

Issue in Witchery's biome changing potion is due to GC's dynamic registered biomes. The server will always have them registered, but the clients wont until they go to the planet.

[Caedis]

Tested locally on a test server with Witchery + many additional biomes + GC

Before fix: Same as the issue that will be closed
After fix: First biome and the last biome in the biome book worked as expected

[glowredman]

Did you also test with GS?

[Caedis]

Just checked the code and we will have to do the same there

[Caedis]

lmk if you can think of a better way to do this. This was just my initial idea for a working fix

[glowredman]

I don't know a cleaner way, though I'd suggest adding a comment explaining why you're doing it. Otherwise someone may simply remove this in the future because the method doesn't do anything besides initializing the classes (which may not be obvious).