[Frontend] type-icon evolving to universal t-item-icon

open #90
Major work in-progress on switching to .t-item-icon from
.type-icon to get item icons working better, especially
in .inspector-location in Inspector;
Significant mods to label.html;

platform/commonUI/general/res/sass/controls/_lists.scss

@@ -32,7 +32,7 @@
 .l-tree-item-flat-list {
 	// For lists of tree-items that are flat. Remove margin, etc. normally needed for the expansion arrow.
 	.tree-item {
-		.label {
+		.t-object-label {
 			left: $interiorMargin !important;
 		}
 	}