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/types.ts

@@ -27,8 +27,8 @@ export interface Action {
   keyPriority?: number;
   keyTest?: (
     event: KeyboardEvent,
-    elements?: readonly ExcalidrawElement[],
-    appState?: AppState,
+    appState: AppState,
+    elements: readonly ExcalidrawElement[],
   ) => boolean;
   contextItemLabel?: string;
   contextMenuOrder?: number;