Removes coremod (#3038)

From now on every integration must not rely on method stripping through
a coremod or @Optional. Notable example for a very good solution is IC2.

As consequence this drops all support for RF and mods must support on of
our supported energy types. At the time of writing, ForgeEnergy and
IC2/EU.

src/main/java/appeng/integration/Integrations.java

@@ -24,7 +24,6 @@ import appeng.integration.abstraction.IInvTweaks;
 import appeng.integration.abstraction.IJEI;
 import appeng.integration.abstraction.IMekanism;
 import appeng.integration.abstraction.IRC;
-import appeng.integration.abstraction.IRF;
 
 
 /**
@@ -43,8 +42,6 @@ public final class Integrations
 
 	static IInvTweaks invTweaks = new IInvTweaks.Stub();
 
-	static IRF redstoneflux = new IRF.Stub();
-
 	private Integrations()
 	{
 	}
@@ -104,10 +101,4 @@ public final class Integrations
 		return invTweaks;
 	}
 
-	static IRF setRedstoneFlux( IRF redstoneflux )
-	{
-		Integrations.redstoneflux = redstoneflux;
-		return redstoneflux;
-	}
-
 }