Remove unused alert view tags
Support filter tournaments by Unviewed

* Extends the 'ShowPreviousTournaments' to optionally filter by unviewed
* removes c# looping of results
Setup markAsViewed to batch update
Only mark as viewed once the user closes the panel
Update unity package
Change showViewedOnly to excludeViewed
Update plugin
Merge pull request #41 from ArbiterGames/IterateUnviewedOnObjCSide

Handle displaying sets of unviewed tournaments on the obj-c side