Add perforce changelist -> p4web linkification.  Resolves #9.
Move CollapseState/toggleListCollapse/showCollapseListLink into sigtrello-collapsing.ts
Move getBestByNameIndex/replaceWithLink/showConvertToCardButton/showConvertToCardLink to sigtrello-checklist-item-to-card.ts
Remove redundant getFlatName from all.ts (see sigtrello-dom-card-window.ts)
Move replaceWithServiceLinks/doReplaceWithServiceLinks into sigtrello-service-links.ts
Sum checklist times automatically - no need for a button.  Resolves #10.
Also authorize immediately instead of on link click.
Merge pull request #21 from MaulingMonkey/master

More SigTrello Improvements