More amplified world features

When the amplified world type is selected in the create world menu, there should be some extra generation features added that would make them even more interesting:

-Caves should be amplified in size

-Oceans should be amplified in depth

-Nether should have its height and depth be extended all the way to build limit to make the vertical size even larger in amplified worlds

-The end dimension should have its height and depth also amplified all the way to build limit as well, allowing for islands to generate at different altitudes, which would make it really fun to use an elytra in amplified worlds.