Add users to groups directly

[berekuk]

New "+ Add" button in the members list, powered by addUserToGroup mutation (mostly copy-pasted from inviteUserToGroup).

I still kept the code for inviteUserToGroup, but removed "+ Invite" button from the UI, only "+ Add" remains.

(It's easy to have both but it could be confusing.)

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Latest commit: 3fb60165cc8af5622d4d11377cc7855d3aebdc36

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[OAGr]

Seems to work well! Kudos for doing it so quickly!