Add hotkeys

[ask9]

1. It would be nice to have hotkeys for items in a context menu for the current tab:

Context menu of layout:

Context menu of a table:

Context menu of a cell:

3. It would be nice to see a full list of hotkeys of the application somewhere (maybe in documentation or in the application itself)

4. It would be nice to remap the existing hotkeys in application

5. It would be nice to specify the hotkeys for commands that don't have a hotkey now by default

6. It would be nice to show context menu of a currently selected area by pressing AppsKey

Ideally, all available commands in the application should be available to bind a hotkey.
The chosen keys for a hotkey are usually not important for a user, if they can be remapped somewhere in application preferences.

[ask9]

Additional hotkey for hiding "Relational data explorer" would be also useful.

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