Refactor UX selection and tools for tunings

[j5v]

Currently, the tool matrix of icons is duplicated for each tuning row. The user selects an icon directly, to operate on the tuning row.

Consider a 'tuning selection' UI, along with a global toolbar that operates on selected tunings.

This would simplify the display, but it would increase the number of gestures required for most operations.

Notes

1. Evaluate what actions need to remain on a tuning row, and whether the space saving and simplification is worth the UI refactor.
2. Create the paradigm of 'tuning selection', and 'tuning focus' for accessibility. Actions: Select all, Toggle selection of current, and Select none.
3. For accessibility, add keyboard shortcuts for actions, and for toolbar/tunings focus, because focus navigation is difficult when actions (a toolbar) are separated from the navigable target objects.
4. With 'tunings selection', keyboard shortcuts for actions would be unambiguous, as the action buttons are present only once in the UI, and use tuning selection as context.
5. Check feasibility of the toolbar design, and the experience of a fragmented UI.