Re-organize all the field hooks into a single file and add the formatter settings form and summary. This will probably see more changes, this is a first pass.

Remove more date format code that is now in core, change name of views field handler to new name, de-opify hook_field using new field parameters.

#698522 Make Views code work with Views 2 and Views 3, patch by rjbrown99, Ahqar, tauno, dagmar, perusio.