Broadcast mouse activity (#1175)

* broadcast mouse activity

* move to same MOUSE_LOCATION event

* remove key up handler

* update tests

* Fix border

* refactor

* rename activity to button

Co-authored-by: Panayiotis Lipiridis <lipiridis@gmail.com>

src/scene/types.ts

@@ -9,6 +9,7 @@ export type SceneState = {
   zoom: number;
   shouldCacheIgnoreZoom: boolean;
   remotePointerViewportCoords: { [id: string]: { x: number; y: number } };
+  remotePointerButton?: { [id: string]: string | undefined };
   remoteSelectedElementIds: { [elementId: string]: string[] };
 };