[Frontend] Applied split pane functionality to edit mode

WTD-1002
SplitPaneController added to edit-object.html;
CSS modded to remove positioning that is now under splitter control;

platform/commonUI/general/res/sass/helpers/_splitter.scss

@@ -20,11 +20,11 @@
 			right: 0;
 			&.top {
 				bottom: auto;
-				height: $splitT;
+//				height: $splitT;
 			}
 			&.bottom {
 				top: auto;
-				height: 100% - $splitT;
+//				height: 100% - $splitT;
 			}
 		}
 		>.splitter {
@@ -33,8 +33,8 @@
 			left: 0; right: 0;
 			width: auto;
 			height: $splitterD;
-			margin-top: ($splitterD + 2) * -1;
-			top: $splitT;
+//			margin-top: ($splitterD + 2) * -1;  // Controlled by splitter
+//			top: $splitT;  // Controlled by splitter
 		}
 	}
 	&.vertical {
@@ -56,8 +56,8 @@
 			bottom: 0;
 			cursor: col-resize;
 			width: $splitterD;
-			margin-left: ($splitterD + 2) * -1;
-			left: $splitL;
+//			margin-left: ($splitterD + 2) * -1;  // Controlled by splitter
+//			left: $splitL;  // Controlled by splitter
 		}
 	}
 }