Refactors grid connections (#3219)

Extracted all checks and subsequent updates to a factory method from the constructor.
Reordered checks to check for nulls before anything else.
Also existing connections before security breaks.
Fixes TileController#checkController() using the wrong position.
Added debug logging for failed connections.
Improved logging.
Inversed boolean so false no longer means security check passed.
Only issue a security break on SecurityConnectionException.

src/main/java/appeng/parts/CableBusContainer.java

@@ -241,11 +241,11 @@ public class CableBusContainer extends CableBusStorage implements AEMultiTile, I
 								{
 									try
 									{
-										new GridConnection( cn, sn, AEPartLocation.INTERNAL );
+										GridConnection.create( cn, sn, AEPartLocation.INTERNAL );
 									}
 									catch( final FailedConnectionException e )
 									{
-										// ekk!
+										AELog.debug( e );
 
 										bp.removeFromWorld();
 										this.setCenter( null );
@@ -292,11 +292,11 @@ public class CableBusContainer extends CableBusStorage implements AEMultiTile, I
 						{
 							try
 							{
-								new GridConnection( cn, sn, AEPartLocation.INTERNAL );
+								GridConnection.create( cn, sn, AEPartLocation.INTERNAL );
 							}
 							catch( final FailedConnectionException e )
 							{
-								// ekk!
+								AELog.debug( e );
 
 								bp.removeFromWorld();
 								this.setSide( side, null );
@@ -637,6 +637,7 @@ public class CableBusContainer extends CableBusStorage implements AEMultiTile, I
 								catch( final FailedConnectionException e )
 								{
 									// ekk
+									AELog.debug( e );
 								}
 							}
 						}