Qutexes: Implement them and supporting classes

Implements: LockSet, SerializedAsynchronousContinuation,
	LockerAndInvoker, LockerAndInvokerBase, Qutex.

Very big leap in functionality here. See qutexes.md for
an explanation of what we've done.

smocore/CMakeLists.txt

@@ -9,6 +9,9 @@ add_library(smocore STATIC
     componentThread.cpp
     component.cpp
     painfulQuale.cpp
+    qutex.cpp
+    lockerAndInvokerBase.cpp
+    lockSet.cpp
 
     # Body
     body/body.cpp