Add keyboard shortcuts for create

[smbea]

What should we do?

Add a shortcut for opening the create menu ('n', 'N') and ('a', 'A') when no selection.

Requirements:

• allow to trigger palette by entry id

Why should we do it?

As part of the replace anything epic, see #1627

[nikku]

Additional detail:

• Append shortcut should work like create shortcut if no selection exists. Why => Because then I can use one shortcut everywhere.

[smbea]

To clarify: 'a' should also trigger the create menu when there is no selection?

[nikku]

Yes, that is my suggestion, and what's implemented on the prototype:

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Important: It embraces locality / popups up where the mouse cursor is.