Refactor Element Functions (#233)

* Remove `generatedraw` from element object

- Create a function that renders a single element
- Refactor rendering selected elements

* Replace getElementAbsoluteXY with getElementAbsoluteCoords

src/scene/index.ts

@@ -1,5 +1,4 @@
 export { isOverScrollBars } from "./scrollbars";
-export { renderScene } from "./render";
 export {
   clearSelection,
   getSelectedIndices,