Fixes spec
Adds specs
Removes selection of default activities
Restores default selection
Adds additional specs
Differs between activity view states
Merge pull request #844 from opf/fix/activity_filter_select_3481_2594

[FIX] Activity filter select 3481 2594
Added changelog entry for former PR
Removed old timelines helper for getting available responsibles
to unify ordering for possible assignees and responsibles on work_package
edit
Merge remote-tracking branch 'origin/dev' into fix/remove_group_responsibles
Adds changelog entry
Merge pull request #856 from opf/fix/remove_group_responsibles
Merge remote-tracking branch 'origin/dev' into feature/responsible_on_bulk_edit_and_context_menu
Adds changelog entries