Update vancouver.csl

Changes: 
+ display "inventor" after inventor's name
+ correctly display webpages (according to 2011 update)
+ display PMCID, or PMID (if available)
I see your point. I used a term so it could be localised.

If "inventor" is considered as an "author", then "inventor" *is* technically the original author of the patent, while applicant/right holder would be the author of the patent.