Shortcuts to zoom in/out and to reset zoom (#770)

* Shortcuts to zoom in/out and to reset zoom

* add support for numerical keys

* Fixed Firefox compatibility

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

src/actions/index.ts

@@ -23,6 +23,7 @@ export {
   actionClearCanvas,
   actionZoomIn,
   actionZoomOut,
+  actionResetZoom,
 } from "./actionCanvas";
 
 export { actionFinalize } from "./actionFinalize";