Enhancement: settings reorganization & improvements, separate admin section (#4251)

* Separate admin / manage sections

* Move mail settings to its own component

* Move users and groups to its own component

* Move default permissions to its own settings tab

* Unify list styling, add tour step, refactor components

* Only patch saved views that have changed on settings save

* Update messages.xlf

* Remove unused methods in settings.component.ts

* Drop admin section to bottom of sidebar, cleanup outdated, add docs link to dropdown

* Better visually unify management list & other list pages

src-ui/src/app/components/manage/management-list/management-list.component.scss

@@ -2,3 +2,11 @@
 .d-block.d-sm-none .dropdown-toggle::after {
     display: none;
 }
+
+tbody tr:last-child td {
+    border-bottom: none !important;
+}
+
+.form-check {
+    min-height: 0;
+}