Menu for default presets

[muzikbike]

Having lists of default presets like vanilla has would be nice, so we can carry over old default generation into cubic chunks and/or get to see some of the best of what CWG has to offer.

A menu for FlatCubic should be easy, as it would just involve carrying over the old vanilla presets, and we'd just need to agree on what goes under y=0.

CustomCubic might be a bit more complicated. We could carry over vanilla custom presets, as well as presets that emulate large biomes and amplified worlds (I think the latter has a preset available on the wiki somewhere). Adding in that one preset that emulates beta world gen would also be cool. The big problem here is that CubicWorldGen doesn't currently generate worlds 100% identically to vanilla custom, even if using the effectively same preset. I'm not sure if the ability to select noise generators as in #47 would generally fix this though, or if maybe some hybrid world setup could be generated to fix it (assuming this could carry over to 1.13+ somehow).