[WIP] Improve master layout for different devices + product growth

We have two pressing needs:

1. Improve experience on real estate challenged devices.
2. Make room for product feature-set growth.

To hit these targets, we need to develop better UX through smarter on-screen space management.

gui/app/templates/components/document/page-heading.hbs

@@ -73,7 +73,7 @@
 						<label>Destination Document</label>
 						{{focus-input type="text" value=docSearchFilter class="form-control" placeholder="a OR b, x AND y, 'phrase mat*'"}}
 					</div>
-					{{ui/ui-spacer size=100}}
+					<Ui::UiSpacer @size=100 />
 					<div class="document-copy-move">
 						{{#if emptySearch}}
 							<p>No matching documents found.</p>
@@ -191,4 +191,4 @@
 			</div>
 		</div>
 	</div>
-{{/if}}
+{{/if}}