Ported all the progress I made for enderscape to endercon

• Support for biome placement using vegetation and humidity for mods to place their biomes
• The terrain shapes have been adjusted, they are generally bigger now
• The center island has been improved
• New island type: Sky islands
  • Sky islands with a very fragmented apperance which generate high over the vast void
  • They have nothing going for them but they are an impressive place to explore
• End border has been split into 2 biomes: End skies and End depths
  • Each refers to either being above or bellow

Prior worlds made with endercon will have ugly chunk borders, I recommend resetting your end by deleting the DIM1 folder on your save (make sure to make a backup)