* Core/Main: fixed main loop error when removing a port.
* Core/{Sessions,Events}: improved logging.
* Frontend/Settings: settings form is now refreshed when section becomes current.
* Frontend/Settings: added discard changes confirmation on navigating away.
* Slaves: fixed missed `value-change` events when received at small intervals of time.
* Reduced some excessive debug logging, by default.
version-0.19.0