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)