Add hotkeys for existing features

Add hotkey for feature "Edit in Index Editor" in Changes-window in main window of an application
Now there is no hotkey for this feature

Ideally, all the features (or most of them) should be assignable for hotkeys (even withoud default hotkey but with ability to assign it in preferences). It simplifies working with any application.

Another frequently used hotkey is hotkey to "Open in Explorer" for "Repositories" panel.