Added functionality for changing the order of the fields for a given event type.
This is achieved using a fieldOrder column in the eventtypefields table. Two buttons
allow the user to move fields up and down and updating their ViewID, which is then added
to the db as the fieldOrder.
When fetching fields from eventtypefields, one should ORDER BY fieldOrder.
Fixed the bug, where number fields required for approval were not checked in edit event.
Changed the style of the up/down buttons to look a little nicer.