lyrics.py: fix regexes used by strip_cruft (make them case insensitive)
lyrics.py: fix regexes used by strip_cruft (make them case insensitive)

strip_cruft() should now correctly replace all <br> with \n thus making
insert_line_feeds() and sanitize_lyrics() functions superfluous (they have been
removed).

sampsyo/beets,asteven/beets,jackwilsdon/beets,shamangeorge/beets,Freso/beets,shamangeorge/beets,jackwilsdon/beets,parapente/beets,swt30/beets,kelvinhammond/beets,ibmibmibm/beets,xsteadfastx/beets,ttsda/beets,PierreRust/beets,jackwilsdon/beets,dfc/beets,beetbox/beets,Andypsamp/CODfinalJUNIT,Dishwishy/beets,diego-plan9/beets,imsparsh/beets,imsparsh/beets,SusannaMaria/beets,ibmibmibm/beets,lightwang1/beets,LordSputnik/beets,multikatt/beets,madmouser1/beets,marcuskrahl/beets,parapente/beets,asteven/beets,shanemikel/beets,madmouser1/beets,Andypsamp/CODfinalJUNIT,mathstuf/beets,mried/beets,YetAnotherNerd/beets,drm00/beets,jmwatte/beets,swt30/beets,kelvinhammond/beets,tima/beets,asteven/beets,Freso/beets,asteven/beets,mosesfistos1/beetbox,beetbox/beets,ibmibmibm/beets,Kraymer/beets,kareemallen/beets,jcoady9/beets,pkess/beets,lightwang1/beets,marcuskrahl/beets,andremiller/beets,mried/beets,kareemallen/beets,sadatay/beets,moodboom/beets,bj-yinyan/beets,MyTunesFreeMusic/privacy-policy,Andypsamp/CODjunit,Dishwishy/beets,jcoady9/beets,artemutin/beets,drm00/beets,madmouser1/beets,shanemikel/beets,jmwatte/beets,Andypsamp/CODfinalJUNIT,lightwang1/beets,m-urban/beets,sadatay/beets,sampsyo/beets,MyTunesFreeMusic/privacy-policy,lengtche/beets,untitaker/beets,LordSputnik/beets,randybias/beets,mathstuf/beets,MyTunesFreeMusic/privacy-policy,LordSputnik/beets,Wen777/beets,diego-plan9/beets,parapente/beets,bj-yinyan/beets,Freso/beets,gabrielaraujof/beets,ibmibmibm/beets,moodboom/beets,mathstuf/beets,lengtche/beets,parapente/beets,arabenjamin/beets,xsteadfastx/beets,marcuskrahl/beets,kareemallen/beets,SusannaMaria/beets,multikatt/beets,mried/beets,arabenjamin/beets,Andypsamp/CODjunit,sadatay/beets,andremiller/beets,marcuskrahl/beets,LordSputnik/beets,m-urban/beets,kelvinhammond/beets,artemutin/beets,lengtche/beets,kelvinhammond/beets,arabenjamin/beets,ruippeixotog/beets,arabenjamin/beets,MyTunesFreeMusic/privacy-policy,Wen777/beets,tima/beets,beetbox/beets,lightwang1/beets,PierreRust/beets,swt30/beets,imsparsh/beets,diego-plan9/beets,jcoady9/beets,Freso/beets,Andypsamp/CODjunit,Andypsamp/CODfinalJUNIT,beetbox/beets,randybias/beets,shanemikel/beets,Andypsamp/CODjunit,jcoady9/beets,pkess/beets,ruippeixotog/beets,mathstuf/beets,gabrielaraujof/beets,gabrielaraujof/beets,shanemikel/beets,mosesfistos1/beetbox,Dishwishy/beets,PierreRust/beets,YetAnotherNerd/beets,gabrielaraujof/beets,bj-yinyan/beets,randybias/beets,Andypsamp/CODjunit,sampsyo/beets,swt30/beets,mosesfistos1/beetbox,pkess/beets,ruippeixotog/beets,PierreRust/beets,pkess/beets,SusannaMaria/beets,Kraymer/beets,dfc/beets,multikatt/beets,diego-plan9/beets,shamangeorge/beets,Wen777/beets,jackwilsdon/beets,ruippeixotog/beets,multikatt/beets,shamangeorge/beets,imsparsh/beets,mosesfistos1/beetbox,Kraymer/beets,mried/beets,untitaker/beets,SusannaMaria/beets,artemutin/beets,xsteadfastx/beets,ttsda/beets,Kraymer/beets,moodboom/beets,sampsyo/beets,jmwatte/beets,untitaker/beets,kareemallen/beets,tima/beets,Andypsamp/CODfinalJUNIT,Dishwishy/beets,ttsda/beets,dfc/beets,madmouser1/beets,untitaker/beets,lengtche/beets,andremiller/beets,YetAnotherNerd/beets,moodboom/beets,jmwatte/beets,drm00/beets,artemutin/beets,m-urban/beets,dfc/beets,ttsda/beets,sadatay/beets,YetAnotherNerd/beets,tima/beets,xsteadfastx/beets,bj-yinyan/beets,drm00/beets,m-urban/beets,randybias/beets