Merge branch '1427-oauth-admin-scopes' into 'develop'

CHANGELOG.md

config/config.exs

config/description.exs

docs/API/admin_api.md

lib/mix/tasks/pleroma/user.ex

lib/pleroma/config.ex

lib/pleroma/plugs/oauth_scopes_plug.ex

lib/pleroma/plugs/user_is_admin_plug.ex

lib/pleroma/user.ex

lib/pleroma/web/admin_api/admin_api_controller.ex

lib/pleroma/web/oauth/oauth_controller.ex

lib/pleroma/web/oauth/scopes.ex

...eroma/web/pleroma_api/controllers/emoji_api_controller.ex

test/plugs/user_is_admin_plug_test.exs

test/web/admin_api/admin_api_controller_test.exs