Merge branch '1.0.x' into prod/1.0.x

uw_theme_admin.info.yml

@@ -20,3 +20,7 @@ regions:
   sidebar_first: 'First sidebar'
 regions_hidden:
   - sidebar_first
+
+# Remove unwanted system stylesheets
+stylesheets-remove:
+  - 'core/themes/seven/css/components/panel.css'