mnemosyne importer tweaks
mnemosyne importer tweaks

- convert newlines to br
- non-greedy match mnemosyne clozes

jakesyl/ruby-card,subfusc/anki,florianjacob/anki,jkitching/anki,LucasCabello/anki,ospalh/libanki3,hssm/anki,jakesyl/ruby-card,Stvad/anki,weihautin/anki,kenjhim/anki,go38/anki,eduOS/anki,holycrepe/anki,abeyer/anki,Arthaey/anki,weihautin/anki,socialpercon/anki-1,sunclx/anki,hssm/anki,xuewenfei/anki