Reintroduce multi-point arrows and add migration for it (#635)

* Revert "Revert "Feature: Multi Point Arrows (#338)" (#634)"

This reverts commit 3d2e59bfed.

* Convert old arrow spec to new one

* Remove unnecessary failchecks and fix context transform issue in retina displays

* Remove old points failcheck from getArrowAbsoluteBounds

* Remove all failchecks for old arrow

* remove the rest of unnecessary checks

* Set default values for the arrow during import

* Add translations

* fix restore using unmigrated elements for state computation

* don't use width/height when migrating from new arrow spec

Co-authored-by: David Luzar <luzar.david@gmail.com>
Co-authored-by: Christopher Chedeau <vjeuxx@gmail.com>

src/actions/actionDeleteSelected.tsx

@@ -4,9 +4,10 @@ import { KEYS } from "../keys";
 
 export const actionDeleteSelected: Action = {
   name: "deleteSelectedElements",
-  perform: elements => {
+  perform: (elements, appState) => {
     return {
       elements: deleteSelectedElements(elements),
+      appState: { ...appState, elementType: "selection", multiElement: null },
     };
   },
   contextItemLabel: "labels.delete",