cosmetic in CGUIWindowVideoNav
videodb: fix videodb:// path for musicvideo artists
utils: add CLegacyPathTranslation
videodb: add translation for legacy paths
musicdb: add translation for legacy paths
musicdb: update musicdb:// paths in "content" table
viewdb: update videodb:// and musicdb:// paths in "view" table
[win32] update VS project files
Merge pull request #2665 from Montellese/legacy_db_paths

add legacy videodb/musicdb path translation