Add QutexAcquisitionHistoryTracker; integrate plumbing

We add the new Qutex acquisision history tracker that allows us
to dynamically detect qutex gridlocks. We've integrated it into
LockerAndInvoker::operator() in a preliminary way.

We also moved all of the trace*ForGridlockOn() methods into the
new QutexAcquisitionHistoryTracker singleton class. They're
more appropriately located there. They're still unimplemented
though.

include/asynchronousContinuationChainLink.h

@@ -13,8 +13,12 @@ namespace smo {
  *
  * The chain walking logic can use dynamic_cast to determine the most
  * derived type and perform appropriate operations.
+ *
+ * Inherits from enable_shared_from_this to allow objects to obtain a
+ * shared_ptr to themselves, which is useful for gridlock detection tracking.
  */
 class AsynchronousContinuationChainLink
+:	public std::enable_shared_from_this<AsynchronousContinuationChainLink>
 {
 public:
     virtual ~AsynchronousContinuationChainLink() = default;