[Frontend] In-progress checkin: color palette SASS

WTD-847
Significant markup and CSS for color palette support;

platform/commonUI/general/res/css/forms.css

@@ -175,7 +175,7 @@ input[type="text"] {
   position: relative;
   overflow: hidden;
   vertical-align: middle; }
-  /* line 122, ../sass/_mixins.scss */
+  /* line 126, ../sass/_mixins.scss */
   .form-control.select:not(.disabled):hover {
     background-image: -webkit-gradient(linear, 50% 0%, 50% 100%, color-stop(0%, #666666), color-stop(100%, #4d4d4d));
     background-image: -webkit-linear-gradient(#666666, #4d4d4d);