Moved DnD event handlers to event.js file; wired clear button up

1 - Blockcode/resources/js/ui.js

@@ -22,32 +22,10 @@ const setupDragAndDrop = () => {
     }
 }
 
-const dragStartHandler = (eve) => {
-    draggedElm = eve.target;
-    console.debug("Node: ", draggedElm);
-    eve.dataTransfer.setData("text", eve.target.tagName.toLowerCase());
-}
-
-const dragOverHandler = (eve) => { eve.preventDefault(); }
-
-const dragDropHandler = (eve) => {
-    eve.preventDefault();
-    eve.stopPropagation();
-
-    const tagTarget = eve.currentTarget;
-
-    if (
-        eve.currentTarget.id.toLowerCase() === "header"     ||
-        eve.currentTarget.classList.contains("flex-parent")
-    ) {
-        if ( draggedElm.parentNode.id.toLowerCase() !== "menu" ) {
-            destroyScriptBlock(draggedElm, tagTarget);
-        }
-
-        return;
+const clearScriptNode = () => {
+    for (const elm of script.children) {
+        elm.remove();
     }
-
-    addBlockToScript(draggedElm, tagTarget);
 }
 
 const addBlockToScript = (draggedTarget, tagTarget) => {