Editor: Refactor fixed user-select rules to css

editor/index.html

@@ -24,7 +24,18 @@
 			button {
 				position: relative;
 			}
-			
+
+			.Panel {
+
+				-moz-user-select: none;
+				-webkit-user-select: none;
+				-ms-user-select: none;
+
+				  /* No support for these yet */
+				-o-user-select: none;
+				user-select: none;
+			}
+
 			#menubar {
 				position: absolute;
 				background: url(trans.png);

editor/js/libs/ui.js

@@ -123,9 +123,6 @@ UI.Panel = function () {
 
 	var dom = document.createElement( 'div' );
 	dom.className = 'Panel';
-	dom.style.userSelect = 'none';
-	dom.style.WebkitUserSelect = 'none';
-	dom.style.MozUserSelect = 'none';
 
 	this.dom = dom;