Add WAILA support for relocators

Bugs:
 - Doesn't work with FMP parts.
 - No stuffed items.
WAILA registers the WailaProvider on the MultiPart block (see: https://bitbucket.org/ProfMobius/waila/src/b8883575a71f810d4a1685002b00511127f4774f/mcp/mobius/waila/addons/thermalexpansion/ThermalExpansionModule.java?at=default#cl-119). It might also be a good thing to split the WailaProviders in multiple classes.