[FancyZones] Responsive drawing (#7125)

* Made drawing zones not clog message processing

* Fixed synchronization bugs

* call BufferedPaintInit

* Some refactoring, the animation is back

* Rename a function

* Align parameters

src/common/on_thread_executor.h

@@ -18,6 +18,7 @@ public:
     OnThreadExecutor();
     ~OnThreadExecutor();
     std::future<void> submit(task_t task);
+    void cancel();
 
 private:
     void worker_thread();