Go to… menu in parts

Created by: roewenstrunk

While going to the page displaying the beginning of a movement or number in scores is easy, we need to have an extra layer for parts in part books.

assigned to @danruebe

Created by: bwbohl

if this is still lan open issue, I can assure you that I fixed it in the OPERA-Editions version some time ago. Merging back was not done due to the ExtJS and repo structure mismatch of the OPERA fork and this repo

added Status: needs review label

mentioned in commit 9cb4cc9d

mentioned in commit b3d6b435

mentioned in commit 1da4fa91

mentioned in commit aa539029