Add support for Ctrl-Tab to Playlist tabs and Tab stack #817
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Resolves #146
This adds support for using Ctrl-Tab and Shift-Ctrl-Tab to switch tabs in the Playlist tabs and Tab stack panels.
This wasn't straightforward to implement; both component have little control over the contents of children, and can also contain nested tabs. Nonetheless, this solution should handle most scenarios well.
Additionally, the existing code to update the keyboard focus when switching tabs in the Tab stack wasn't working correctly. This has been fixed as part of this, and the focus is now set to the first focusable element in the new tab (unless the tabs themselves were previously focused, or the new tab doesn't have any focusable children).