TileGateway is considered finished. It now contains only teleport and disposal logic. Also, endpoint's disposal is conveniently handled by TE's invalidation. TODO: multiblock construction and init
Moved multiblocks to separate file. The question on how to handle
construction persists.
Some uncouplings, refactrings, removals etc. NetherMultiblock is not a
RedstoneMultiblock's descendant anymore. Added it to list of
multiblocks.
TODO: do something to construction. Can't guess something elegant
TODO: possibly do something to sub-block metas, there's too many of
them.