The first issue is using `updateCurrentUser` when code was conditional
in an initializer. Instead we need to use `needs.user()`.
The second issue was trickier to track down but we were using an
observer in a syncrhnous way which is not allowed in newer Embers. This
removes the observer (and some dead code around it!) so that we can
execute that code synchronously.
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
discoursebot