Allow staff distances to "float" between a min and max as already happening for system distances
Steps to reproduce issue:
1. Open a score with many parts, usually an orchestral score
2. Go to Format>Style>Page>Staff distance
As for now, it is possible to insert only one value for this distance. There could be an alternative option to choose to insert a floating value between a minimum and a maximum, as it is already happening for the system distance. This would be helpful if someone wants to have an orchestral score with all staves equally distributed in each page, without needing to do manual adjustements.
In the attached example page 1 and 2 are ok, but 3 and 4 need to be more spaced, and a lot of spacers would be needed for a balanced result.
See also https://musescore.org/en/comment/924739#comment-924739