Debugger: More work on signal configuration.

- Introduce SignalDispositionEditWindow for add/editing disposition
exceptions.

SignalsConfigView:
- Factor out helper class SignalDispositionMenu. Use accordingly in
SignalsConfigView and SignalDispositionEditWindow.
- Watch table selection changes to update button statuses appropriately.
- On add/edit request, show disposition edit window.
- Listen for disposition changes from team and react accordingly.

UiUtils:
- Add helper function to map signal defines to strings.

Together with the previous set of commits, this implements #9720.

Debugger: Add config view for signals.

SignalsConfigView:
- Provide basic configuration for signal dispositions.

TeamSettingsWindow:
- Add signals view to tab list.

Debugger: More work on signal configuration.

- Introduce SignalDispositionEditWindow for add/editing disposition
exceptions.

SignalsConfigView:
- Factor out helper class SignalDispositionMenu. Use accordingly in
SignalsConfigView and SignalDispositionEditWindow.
- Watch table selection changes to update button statuses appropriately.
- On add/edit request, show disposition edit window.
- Listen for disposition changes from team and react accordingly.

UiUtils:
- Add helper function to map signal defines to strings.

Together with the previous set of commits, this implements #9720.

Debugger: Add config view for signals.

SignalsConfigView:
- Provide basic configuration for signal dispositions.

TeamSettingsWindow:
- Add signals view to tab list.