New feature: Add Origin

Since SheMov now displays origin files (i.e. source files for a
reencode), add an option here to add origin files for already archived
movies.

We guess the archived movie from the filename by cutting off the
extension and look it up in the files table.

If we find an archived movie with that filename, mark the source blue.
Deactive "Add" if we don't find one or if we already have an origin.

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