Some changes in condition
Relocated sources closer to project root - didn't like that 100500 folder nesting anyway. Also relocated all Forge profile files to 'run' folder so they don't mix with sources
Added gateway block sketch. Added multiblock checker to item use hook.
Added main teleporter's blocks and made them work. Exit-point construction and teleport code on the go.
Added minimal code which correctly spawns gateways in source world and in Nether. There's no 'optimal lookup' as for now.
Added gateway blocks linking and proper chain construction. Some refactoring over existing code.
Created object Gateway and moved some dimension-related stuff there