Make some API changes simplify the tag editing code. We now have a

good pattern for allowing modules to add their own hooks to item forms!

1) Album, photo and movie forms now all use edit_item as the group and
   we publish item_edit_form and item_edit_form_completed events which
   makes it much easier in the module to handle all events.  They can
   still differentiate based on $item->type if they want to.

2) Added tag::clear_all() and tag::compact() functions which takes the
   place of hiwilson's tag::update() function and is now used in
   tag_event::item_delete().  This provides a simple API that allows
   us to have a lot less event handling code.  It's less efficient
   than what hiwilson was doing before in that it will delete and
   re-add tags, but if that ever turns out to be a performance issue
   we can do something about it then.

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