scrobbler, regexp stream tags (re)formatting

hi,
when using new scrobbler-plugin feature - submiting data from streams, i've encountered a problem:
streaming server was sending its name as artist tag and "artist - title (album)" as title tag and this data was sent to scrobbling service.

With my patch it is possible to define named regexps (in config window of scrobbler plugin) to reformat received tags.
This functionality is enabled only for streaming, hope you like it :)