* FEATURE: Allow Category Group Moderators to edit topic titles
Adds category group moderators to the topic guardian’s `can_edit` method.
The value of `can_edit` is returned by the topic view serializer, and this value determines whether the current user can edit the title/category/tags of the topic directly (which category group moderators could already do by editing the first post of a topic).
Note that the value of `can_edit` is now always returned by the topic view serializer (ie, for both true and false values) to cover the case where a topic is moved out of a category that a category group moderator has permissions on, so that when the topic is reloaded the UI picks up that `can_edit` is now false, and thus the edit icon should no longer be displayed.
* DEV: Add a comment explaining why `can_edit` is always returned
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