change the way ControlProtocols (control surfaces) are notified and handle Stripable...

change the way ControlProtocols (control surfaces) are notified and handle Stripable selection changes

The Editor continues to notify them, but via a direct call to ControlProtocolManager, not a signal.
The CP Manager calls the ControlProtocol static method to set up static data structures holding
selection info for all surfaces and then notifies each surface/protocol that selection has changed.