[#1427] OAuth admin scopes
Closes #1427 (closed)
AdminFE support MR (could be processed separately; BE MR works with existing versions of AdminFE as well): admin-fe!69 (merged)
PleromaFE support MR (could be processed separately; BE MR works with existing versions of PleromaFE as well): pleroma-fe!1024 (merged)
Edited by Ivan Tashkinov