Kernel: Implemented Pulse event and timers.

Closes #1904

src/core/hle/kernel/kernel.h

@@ -156,7 +156,7 @@ public:
      * Wake up all threads waiting on this object that can be awoken, in priority order,
      * and set the synchronization result and output of the thread.
      */
-    void WakeupAllWaitingThreads();
+    virtual void WakeupAllWaitingThreads();
 
     /// Obtains the highest priority thread that is ready to run from this object's waiting list.
     SharedPtr<Thread> GetHighestPriorityReadyThread();