* FIX: Disabling of header sorting now checks the correct site setting, and defaults to false
* Fixed qunit test to set the category's disable_topic_resorting custom_field
FEATURE:
- Added custom fields `sort_topics_by_event_start_date` and `disable_topic_resorting`
- Sort topics of event categories by event start date. Event categories have custom field `sort_topics_by_event_start_date` set to true.
- Disable re-sorting of categories with custom field `disable_topic_resorting`
- Event date displayed beside the Topic title can optionally be set to show the local date-time, instead of relative date-time.
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Jarek Radosz