[videodb] fixup UpdateLink(Actor)Table
[videodb] move artistlinkmusicvideo to actorlink table
[videodb] switch taglinks table to the same format as other link tables
[videodb] cleanup GetPeopleNav to use new link setup
[videodb] cleanup GetCommonNav to use new link setup
[videodb] change country table to new layout
[videodb] change genre table to the new format
[videodb] change studio table to the new format
[videodb] change actor table to the new format
squish into director - renaming link table
squish into writer - renaming link table
[videodb] factor out index creation of link tables + add missing indicies
[videodb] tags can be updated using UpdateLinkTable
[videodb] cleanup and unify link table addition
[videodb] simplify the AddLinkToActor/AddToLinkTable/RemoveFromLinkTable functions
[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