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/core/api/ApiGrid.java

@@ -59,7 +59,7 @@ public class ApiGrid implements IGridHelper
 		Preconditions.checkNotNull( a );
 		Preconditions.checkNotNull( b );
 
-		return new GridConnection( a, b, AEPartLocation.INTERNAL );
+		return GridConnection.create( a, b, AEPartLocation.INTERNAL );
 	}
 
 }