Merge branch 'release/2.0.3' into 'stable'

CHANGELOG.md

docs/API/admin_api.md

docs/configuration/hardening.md

lib/pleroma/activity.ex

lib/pleroma/ecto_enums.ex

lib/pleroma/following_relationship.ex

lib/pleroma/notification.ex

lib/pleroma/plugs/auth_expected_plug.ex

lib/pleroma/plugs/authentication_plug.ex

lib/pleroma/plugs/http_security_plug.ex

lib/pleroma/plugs/legacy_authentication_plug.ex

lib/pleroma/plugs/mapped_signature_to_identity_plug.ex

lib/pleroma/plugs/oauth_scopes_plug.ex

lib/pleroma/plugs/plug_helper.ex

lib/pleroma/plugs/uploaded_media.ex

lib/pleroma/signature.ex

lib/pleroma/stats.ex

lib/pleroma/tests/oauth_test_controller.ex

lib/pleroma/user.ex

lib/pleroma/user/query.ex