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Issue description: When connecting, disconnecting or picking up the generator the game immediately crashes

Steps to reproduce:

1.Place Heat generator in the world, Mine it up to try and move it
2.Place heat generator in world and connect or disconnect cables. Doesn't matter if its from mekanism or not it crashes anyways
3.

Version (make sure you are on the latest version before reporting):

**Forge:14.23.5.2796
**Mekanism:Current release version
**Other relevant version:Also have the mekanism generator mod installed

If a (crash)log is relevant for this issue, link it here: (It's almost always relevant)

2018-12-13-7.log.gz

crash-2018-12-13_18.07.38-server.txt
This is my first time reporting so i'm not sure if its the file with the report or this one you need

java.util.ConcurrentModificationException
	at java.util.IdentityHashMap$IdentityHashMapIterator.nextIndex(IdentityHashMap.java:734)
	at java.util.IdentityHashMap$KeyIterator.next(IdentityHashMap.java:825)
	at aroma1997.tatw.ic2usesfe.block.ICSourceEventListener.tick(ICSourceEventListener.java:76)
	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_2418_ICSourceEventListener_tick_WorldTickEvent.invoke(.dynamic)
	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)

Not us, report to ic2usesfe