Dbg:Add CallableTracer for callables post()ed to boost.asio

This class and its macro allow us to trace the invocation of
callbacks as they're invoked by Boost.asio.

CMakeLists.txt

@@ -61,6 +61,14 @@ if(ENABLE_DEBUG_LOCKS)
     set(CONFIG_ENABLE_DEBUG_LOCKS TRUE)
 endif()
 
+# Set the debug trace callables variable for config.h
+if(ENABLE_DEBUG_TRACE_CALLABLES)
+    set(CONFIG_DEBUG_TRACE_CALLABLES TRUE)
+    # Suppress frame-address warnings when using __builtin_return_address()
+	# with values above 0 (See callableTracer.h).
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-frame-address")
+endif()
+
 # Set the world thread variable for config.h
 if(WORLD_USE_BODY_THREAD)
     set(CONFIG_WORLD_USE_BODY_THREAD TRUE)