CiviEvent Dashboard - Event Summary table shows events farthest in the future first and may not show current and upcoming events

The current query for showing events in the dashboard event summary is not ideal. ORDER BY is end_date DESC with limit 10. We should ORDER BY start_date ASC so current and upcoming events float to the top. The WHERE clause should include events where start date is greater than 7 days ago - so we catch events which have just completed and events which are coming up soon.