restructure main menu: step 1
restructure main menu: step 2
restructure main menu: step 3
restructure main menu: step 4 (rename variables, fix Gerrit plugin dynamic menu retrieval)
restructure main menu: step 5 (separators, dashboard vs. repo)
Reorder Commands menu according to #1629
Remove unused "View changes" menu item (see https://github.com/gitextensions/gitextensions/pull/1447#issuecomment-11270791)
Dashboard: Move "Show current branch" from context menu to main Dashboard menu (Dashboard.Designer.cs: untabify)
Fix "Settings could not be opened from dashboard" (bug was introduced with 6db563731e965c14a73759fb43a6d47bd3813e84)
Merge pull request #1629 from feinstaub/topic_main_menu_structure

restructure main menu (fixes #1576)