Adds three new search modifiers:
- in:assigned for assigned topics
- in:unassigned for unassigned topics
- assigned:{username} to list topics assigned to a specific user
These modifiers are all made available in the advanced search sidebar
* FEATURE: Display PMs in assigned activity and differentiate them.
* FEATURE: Unassign/Re-assign tasks from the activity view
* Remove bulkAssign. Reuse assign/unassign with a service. Change PM icon position
* Reuse ListItemDefaults instead of duplicating code.
* Conditionally show/hide feature if list items defaults is present in core
Ahmed Gagan
Roman Rizzi
Guo Xiang Tan
Arpit Jalan