Reworked cable connections (#3334)

* Reworked cable connections

Added enums for cable variants and sizes.
Rules for connections between a cable and another cable or grid member
are much more simple without any exceptions for certain combinations.
1/ Connections are rendered as the lowest type between cores.
2/ Each type uses are core for clear separation.
3/ The core will always be on the cable with the higher order.

src/main/java/appeng/parts/networking/PartDenseCable.java

@@ -136,7 +136,7 @@ public abstract class PartDenseCable extends PartCable
 		if( te instanceof IGridHost )
 		{
 			final AECableType t = ( (IGridHost) te ).getCableConnectionType( of.getOpposite() );
-			return t == AECableType.DENSE_COVERED || t == AECableType.DENSE_SMART;
+			return t.isDense();
 		}
 
 		return false;