Improve top tracks

[obcd]

Hey,

With the "details" option, I can see the songs weirdly tagged on last.fm that appear on the top tracks and that musiccabinet fails to associate with files in my library. Here are some areas where it could be improved:
- Accents, for instance a song in the top tracks list uses "a" while the correct character is "à"
- Characters that aren't letters, like "-" could be ignored. It seems to prevent songs from being recognized
- Featuring, often the title of the song contains "featuring XYZ". One problem is that Musicbrainz (my library is synchronized with it) has clean titles. If anythng after "feat."or "featuring" were ignored it could improve the detection.

One problem that could emerge is that then there would be duplicates inside the top tracks list.

[hakko]

It's a bit surprising that last.fm doesn't try to clean/merge seemingly duplicate tracks, actually.

[obcd]

Another silly thing:
"I’m Shipping Up to Boston" and "I'm Shipping Up To Boston" aren't associated. MB uses ’ when last.fm uses '