Removed the code associated with Limbo decay from EventHookContainer,
LimboBlock, and CommonTickHandler. DimHelper still has blocksToDecay
since removing it could cause deserialization failures. However, nothing
should actually use that list. I also removed several unused or
redundant methods (e.g. overriding methods and putting in exactly the
same code as in the super class), fixed indentation and renamed cryptic
variables. We should have a rule against allowing cryptic variable names
like "par2", even if they're inherited from Forge. I'll implement proper
limbo decay in the next commit.
Renamed block 1973:1 to Ancient Fabric. Renamed block 220 to Eternal
Fabric. I assigned new names so that we didn't need to use the long ones
we had before (e.g. "Fabric of Reality Permanent/Pushable"). Also
removed unused imports from various classes along the way.
