* FEATURE: site setting to include expired events on calendar views
Adds a new site setting to include expired events on calendar views (Upcoming Events and Category Calendar).
Past events are displayed with the configured color (from the category or from the "Map events to color" site setting) as text and border colors instead of the background.
* FEATURE: add events calendar on the category page
This commit adds a new site setting `events calendar category` for events calendar that is separate and independent from `calendar categories`. If a category is present in both `events calendar category` and `calendar categories` then priority is given to `calendar categories`.
* remove some jQuery usage
* rename `events_calendar_category` to `events_calendar_categories`
* add tests
Renato Atilio