Misc UI 6 (#2338)

* Sanding and shimming on loading CSS

- Wait spinners in the tree;
- Move spinner and loading CSS from legacy to global.scss;

* Misc UI 6
- Better approach to Time Conductor overflow;
- Fixed main page left/right clipping issue;
- Fixed table header bg styling that had issues in legacy tables;
- Fixed Time Conductor datetime picker clipping issue;
- New .c-message--simple for use in Summary Widgets;
- Better styling for header in empty Tabs view;
- Fixed Chrome 73 scrolling bug in Summary Widgets;
- Fixed problem in Inspector <li> elements from new wait spinner;
- Fixed color of <a> tags in tables to be more visible;
styling;

* Misc UI 6

- Fix VISTA session selector not scrolling (Chrome 73 overflow bug);

* Misc UI 6

- Fix VISTA session selector not scrolling (Chrome 73 overflow bug);

src/api/overlays/components/DialogComponent.vue

@@ -36,7 +36,7 @@
 
     .c-message {
         display: flex;
-        align-items: flex-start;
+        align-items: center;
 
         > * + * {
             margin-left: $interiorMarginLg;
@@ -66,6 +66,17 @@
             font-size: 1.2em; // TEMP
         }
 
+        &--simple {
+            // Icon and text elements only
+            &:before {
+                font-size: 30px !important;
+            }
+
+            [class*='__text'] {
+                font-size: 1.25em;
+            }
+        }
+
         /************************** LEGACY */
         &.message-severity-info:before {
             @include legacyMessage();