Add modules to WAILA for relocators.

Bugs:
 - Doesn't work with FMP parts.
 - No stuffed items.
Further work on stuffed item rendering, currently does not work.
Attempt adding FMP support, so far, no good.
Stuffed items does not work, due to not using NBT.

Split WAILA handlers into seperate classes.
Woops, forgot to add actual files for BlockExtender and Relocator to prev. commit.
Merge pull request #142 from MCMicky2506/waila_integration

Waila integration (Again, this should be good now)