Moves action menu styles to sass
Defines specific action menu
Adds specific action menu to project modules
Makes project index menu specific
Adds specific menu to admin modules
Removes superfluous query index
Adds specific action menu to repository views
Adds specific main menu to remaining views
Fixes action menu event binding
Fixes cukes
Fixes functional tests
Merge remote-tracking branch 'origin/dev' into fix/accessibility_linearisation_of_work_package_show_form_2259

Conflicts:
	app/views/users/show.html.erb
Rename folder containing specific javascript assets
Add label to submenu toggle arrow icon (#2231)
Move project menu js to specific javascript asset
Update Changelog (#2231)
Wrap up submenu toggle in anchor for better accessibility (WIP)
Wrap main item links
Disable separate submenu toggle highlighting for default theme
Replaces 'th' by 'td' elements