Add a personal group for an all-communities state

Design is approximate and needs review, though being completed out of band.

res/css/structures/_TagPanel.scss

@@ -51,9 +51,9 @@ limitations under the License.
 
 .mx_TagPanel .mx_TagPanel_divider {
     height: 0px;
-    width: 34px;
-    border-bottom: 1px solid $panel-divider-color;
-    display: none;
+    width: 90%;
+    border: none;
+    border-bottom: 1px solid $tagpanel-divider-color;
 }
 
 .mx_TagPanel .mx_TagPanel_scroller {
@@ -116,6 +116,10 @@ limitations under the License.
     border-radius: 0 3px 3px 0;
 }
 
+.mx_TagPanel .mx_TagTile.mx_TagTile_large.mx_TagTile_selected::before {
+    left: -10px;
+}
+
 .mx_TagPanel .mx_TagTile.mx_AccessibleButton:focus {
     filter: none;
 }