Close menus on esc

[hojjatabdollahi]

Previously when a menu was open, pressing esc would be swallowed by cosmic-comp and the grab would be unset on the menu, so the second esc would be sent to the main window and it would close the open context menu.

After pop-os/cosmic-comp#2859 every menu that has keyboard grab will receive the esc, and it has to close itself.
So the first commit, closes the menu when it receives esc. But it closes the innermost menu, so if you have submenus open, every Escape closes another submenu until they're all closed.

Clicking outside the menu still closes all of them all at once.

While investigating this, I also noticed that if an action has multiple bindings the menu randomly chooses a binding, so I added a heuristic to choose the binding:

• first go for fewer key presses
• then go for characters instead of named keys (so ctrl+c over ctrl+insert)
• and finally go with Ord, to stay consistent

This also updates Iced, which is unrelated, but avoids an extra PR (which Fixes #1320).

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