Imdbid from nfo and sync / sorting

Added to sort the most likely wanted subtitles on top even if moviehash search fails, added another condition to mark the subtitle as in sync.

Added support for fetching IMDB id from nfo.

Changed so that if a manual string is entered, that string is the only thing being searched for. Don't append the query string to the search if searching by moviehash or IMDB id succeeded, it returns to many unwanted results. Only use the query string in the search if moviehash and IMDB id search returns empty or if manual search or if it's a TV Show.
I did some more tests on the latest stable and on the alpha, also on the latest nightly to test the preferred language sorting and everything is working fine. I have tested everything I could think of and no errors, and everything is displaying the way it's intended to.