Locking: Add basic reactive deadlock detection foundation

We added a timestamp to each Lockvoker so that we can detect when
a lockvoker has been in a qutex for "too long", where "too long"
is defined arbitrarily as 500ms.

Next we're going to change the way we create callbacks to enable
us to more explicitly access the sh_ptr<AsyncContin> via
the callback object.

smocore/CMakeLists.txt

@@ -12,6 +12,7 @@ add_library(smocore STATIC
     qutex.cpp
     lockerAndInvokerBase.cpp
     lockSet.cpp
+    serializedAsynchronousContinuation.cpp
 
     # Body
     body/body.cpp