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/element/newElement.ts

@@ -1,6 +1,7 @@
 import { randomSeed } from "roughjs/bin/math";
 import nanoid from "nanoid";
 import { Drawable } from "roughjs/bin/core";
+import { Point } from "roughjs/bin/geometry";
 
 import { ExcalidrawElement, ExcalidrawTextElement } from "../element/types";
 import { measureText } from "../utils";
@@ -34,6 +35,7 @@ export function newElement(
     isSelected: false,
     seed: randomSeed(),
     shape: null as Drawable | Drawable[] | null,
+    points: [] as Point[],
   };
   return element;
 }