- FIX: properly scope category changes to what the current user can see
- UX: previous category is now highlighted in "red", new category is highlighted in "green"
- PERF: no need to serialize the categories
- FIX: properly track wiki
- FIX: properly track post_type (aka. Staff Color)
- FIX: properly track making a topic a PM
- FIX: never show the category changes when a topic is made a PM
- PERF: post_revision serializer is now more leaner (never includes title changes when post_number > 1, never includes user changes if there aren't any)
- UX: always sort the tags by name
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