Sync panel props to editing element (#470)

* ensure panel props are sync to editing elem

* ensure we don't create empty-text elements (fixes #468)

* remove dead code

Co-authored-by: Christopher Chedeau <vjeuxx@gmail.com>

src/element/index.ts

@@ -1,4 +1,4 @@
-export { newElement, duplicateElement } from "./newElement";
+export { newElement, newTextElement, duplicateElement } from "./newElement";
 export {
   getElementAbsoluteCoords,
   getDiamondPoints,