Improve gameplay

shared/src/objects/game-object.ts

@@ -1,5 +1,14 @@
+import { UpdateMessage, UpdateObjectMessage } from '../main';
 import { Id } from '../transport/identity';
 
 export abstract class GameObject {
   constructor(public readonly id: Id) {}
+
+  public calculateUpdates(): UpdateObjectMessage | undefined {
+    return;
+  }
+
+  update(updates: Array<UpdateMessage>): void {
+    updates.forEach((u) => ((this as any)[u.key] = u.value));
+  }
 }