Organ pedal marks

[PetJer]

This is a PR for organ pedal marks.

• Organ palette with symbols
• Popup
• Input mode

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Known issues:

• Selecting a note and applying a pedal mark from the palette opens popup in wrong position
• "Side-of-foot" not having the right offset (because it doesn't collide with the note beam)
• Layout doesn't work on other voices than voice 1
• Wrong accessibility name

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• I signed the CLA
• The title of the PR describes the problem it addresses
• Each commit's message describes its purpose and effects, and references the issue it resolves
• If changes are extensive, there is a sequence of easily reviewable commits
• The code in the PR follows the coding rules
• There are no unnecessary changes
• The code compiles and runs on my machine, preferably after each commit individually
• I created a unit test or vtest to verify the changes I made (if applicable)

[cbjeukendrup]

@mike-spa may want to check these two additions :)

[cbjeukendrup]

This should probably be changed to be more in accordance with PR #20850 (see especially Articulation)

[rettinghaus]

@PetJer any updates on this?

[PetJer]

@rettinghaus

There was no progress since September. I'm in touch with the team, so right now I'm waiting for the designs (it's not a priority feature, so it's understandable). I'll continue with the work in late June, when I hope the designs will be ready.

FYI @avvvvve

[bkunda]

@PetJer we're interested in re-reviewing this PR if you're still available and keen to work on it again.

It will need a rebase before we're able to review it: is this something you're able to do?

I do have a couple of questions:

1. Popups always cause additional headaches from an implementation POV. For an MVP of this feature, what do you think about creating just the dedicated palette of symbols?
2. I admit I don't know much about what these symbols are supposed to denote: are there any playback implications the user might expect from these instructions?

[PetJer]

@bkunda I'm keen on working on the project, but I won't be able to work on it until summer.

1. I think creating a dedicated palette with the following SMuFL symbols: keyboardPedalToe2, keyboardPedalToe1, keyboardPedalHeel1, keyboardPedalHeel2, keyboardPedalHeel3; is the bottom-line for this feature. My implementation (that is essentially a copy of the fingering system) placed the mentioned symbols as intended (they should be downscaled). From here it's a matter of debate if this is an MVP, but I expect that this implementation should accommodate the basic needs for the majority of users.
2. This symbols are treated as "fingering" for the feet and there are no playback implications.

The mentioned bottom-line shouldn't be too difficult to implement for anyone who knows the codebase well. If someone decides to tackle this feature before me, I'm open to give feedback (better to make another PR then).

[PetJer]

Followed by #34517.