[videodb] refactors UpdateActorLinkTable into UpdateActorLinksToItem, AddActorLinksToItem, with special case for musicvideos
[videodb] switch actor table and links to the new layout
[videodb] cleanup AddCast, AddLinkToActor to drop unused params
[videodb] switch the studio and link tables to the new format
[videodb] switch the genre and link tables to the new layout
[videodb] switch the country and link tables to the new layout
[videodb] switch the tag and link tables to the new layout
[videodb] updates UpdateLinkTable() with the necessary changes for genre, country, studio etc.
[videodb] cleanup GetCommonNav to use new link setup
[videodb] tags can be updated using UpdateLinkTable
use AddLinksToItem for tags, genre, studio, countries
[videodb] refactor UpdateLinkTable into AddLinksToItem, UpdateLinksToItem
[videodb] cleanup genre, country, studio additions
drops addgenredirectorstudio
[videodb] simplify AddToLinkTable, RemoveFromLinkTable implementations
[videodb] adds Append*Filter() to simplify repetitive queries in GetFilter
[videodb] FIX: drop incorrect querying of non-existent setlinkmovie table
[videodb] cleanup the smartplaylist queries of link tables into a common function
[videodb] use type_view for views