Added sortable palette (basic mode)

Started advanced palette block

js/_pixelEditorUtility.js

@@ -260,4 +260,11 @@ function getPixelPosition(index) {
 	let y = Math.floor(linearIndex / layers[0].canvasSize[0]);
 
 	return [Math.ceil(x), Math.ceil(y)];
+}
+
+/** Sets isDragging to false, used when the user interacts with sortable lists
+ * 
+ */
+function makeIsDraggingFalse(event) {
+	dragging = false;
 }