Song Notes on Setlists

[devmount]

Is your feature request related to a problem? Please describe.
Song notes are currently global for songs. There should be a possibility to save notes to songs for a specific setlist.

Describe the solution you'd like
There should be an additional context menu entry for songs in a setlist, to add notes. These notes should be displayed on the setlist in presentation mode.

Describe alternatives you've considered
None

Additional context
None