Local Ports are able to be started without incoming connections, then use a lot of CPU

Currently, validation of a LocalPort simply checks that it has an outgoing connection. This means that it's possible to create an outgoing connection for a port but not have any incoming connections. When this happens, if the Port is started, the framework determines that it is a "source component" because it has no incoming connections. As such, it is never yielded via the "bored yield duration". This results in high CPU usage.

The fix in this case, I believe, is to address the validation. We should not allow a Local Port to be enabled if it has no incoming connections.