Kernel: pass ref down to Object and wrap ID counter into kernel state

src/core/hle/kernel/wait_object.h

@@ -16,6 +16,8 @@ class Thread;
 /// Class that represents a Kernel object that a thread can be waiting on
 class WaitObject : public Object {
 public:
+    using Object::Object;
+
     /**
      * Check if the specified thread should wait until the object is available
      * @param thread The thread about which we're deciding.