Implement ThreadedQueue plus unit test
Removed redundant headers from xml file
Fixed Message SetHandled/Handled stuff
Changed FIXME tags to @fixme for doxygen, doesn't seem to help
Fixed Messaging README.md for doxygen
Preparing for modularization
__thread_id -> std::thread::id
Keep minGrow/maxGrow values intact after moving from container
Added a little stresstest to ThreadedQueueTest, crunch through 1 million messages