UX: Improve scoreboard match filtering options

[hansfn]

Based on using (viewing) junior NM matches on https://live.osvb.no/ this year (and last year) I suggest extending the match filtering with the following:

• Add "Choose class" similar to "Choose day". That enables viewing all matches for one class - say "GU15". (I think this is useful for selecting "Men" or "Women" for Norges Tour too.)
• Extend "Choose Court" to allow multi select. Very often I want to view two or three courts. (On Desktop this is typically "Shift click". Not sure how this is best implemented on mobile.)
• Add "Choose team" to view all matches for one team. Maybe allow multi select here too?
• Add "Choose group" similar to "Choose class".

I think the list is sorted from highest to lowest priority IMO.