challenges: fix disappearing repeat bug
groups: only add privacy field on guilds
groups: some static bindings where possible
groups: only show invitations if there are any (was previously
iterating empty array)
groups: very precarious placement of query motifs and subscription /
fetch order due to https://github.com/codeparty/racer/issues/57 for
guilds, party, habitRPG group, and publicGroups.