* Enable multi points in lines
* Stop retrieving arrow points for lines
* Migrate lines to new spec during load
* Clean up and refactor some code
- Normalize shape dimensions during load
- Rename getArrowAbsoluteBounds
* Fix linter issues
* Remove `generatedraw` from element object
- Create a function that renders a single element
- Refactor rendering selected elements
* Replace getElementAbsoluteXY with getElementAbsoluteCoords
