Feature: Add Default button on node properties

src/html/properties.html

@@ -44,6 +44,7 @@
 							<td><span>Image :</span></td>
 							<td>
 								<button id="ImageReset">Reset</button>
+								<button id="ImageDefault">Default</button>
 								<button class="hidden" id="ImageRefresh">Refresh</button>
 								<button class="hidden" id="ImageCapture">Capture</button>
 								<input id="ImageFile" type="file" style="width:180px;">