tentative fix for packet leaks, #1855
Merge branch '5.0.x' into 6.0.x

Conflicts:
	common/buildcraft/BuildCraftBuilders.java
	common/buildcraft/BuildCraftCore.java
	common/buildcraft/BuildCraftEnergy.java
	common/buildcraft/BuildCraftFactory.java
	common/buildcraft/BuildCraftSilicon.java
	common/buildcraft/BuildCraftTransport.java
	common/buildcraft/builders/network/PacketHandlerBuilders.java
	common/buildcraft/core/network/PacketHandler.java
	common/buildcraft/core/network/PacketTileState.java
	common/buildcraft/factory/network/PacketHandlerFactory.java
	common/buildcraft/silicon/network/PacketHandlerSilicon.java
	common/buildcraft/transport/network/PacketHandlerTransport.java