Add "Focus Other View" action

Replace the setting "Switch between views with Tab key" with a
dedicated "Focus Other View" action (which can be bound to the Tab key
if the user wants to).
The "Focus Other View" action moves the keyboard focus to the inactive
split view. When there is no other view, split view is triggered
instead. The action is located in `Menubar>View`.

### Motivation
The Tab key is essential for keyboard navigation within an application.
The old "Switch between views with Tab key" setting forces users to
give up on the intended purpose of the Tab key, which means many
keyboard-bound users currently do not have a way to switch between
views when using the "Split" feature. The dedicated "Focus Other View"
action gives users more control, and they can change the keyboard
shortcut as they are used to.

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