GtkWidget implements connect() but pylint doesn't know that

Add open_window() which is more concise

We define the same shortcut for win.browse-history

Daniel Brötzmann authored 5 years ago and Philipp Hörist committed 5 years ago

- Light refactoring for adding actions

- Use event as var name instead of obj
- Use event_filter()
- Unify handler method names

- Group all event handlers
- Use event as var name instead of obj
- Use event_filter()
- Unify handler method names

- Group all event handlers
- Use event as var name instead of obj
- Use event_filter()
- Unify handler method names

Allow comparing attributes with different names

Example:
```
@event_filter(['account', 'jid=own_jid'])
def _on_event(self):
    pass
```

_on_event() is only executed if the event attribute `jid` matches the
`own_jid` attribute on self

There is no need to split functionality out into MessageControl because
all Controls use ChatControlBase. This simplifys the code.

This is a variation that unregisters all events on `destroy`

This class provides easier access to registering events and more
importantly it deals with automatically unregistering all events with
a simple call of unregister_events()

This helps with objects getting correctly garbage collected