Add scope guard classes. Add Logger::RegisterThreadNoDramaCtx, UFACE...

Add scope guard classes. Add Logger::RegisterThreadNoDramaCtx, UFACE constructor will complain if in DRAMA message loop

   TUFace constructor will now throw if you are creating this within
     the thread running the DRAMA main loop - catches a partricular
     class of issues. Ticket ASI-162.

    Add drama::ScopeGuard class - a simple scope guard class which
    sets a value to a particular value when constructed and then resets
    it on exit.  Also add the variation ScopeGuardAtomic for gaurding
    access to atomic types (a thread safe version)

    Added Logger::RegisterThreadNoDramaCtx(). When invoked for a thread
    which is really not a DRAMA thread, that thread can use the DRAMA logger
    in a well defined way.  Does introduce a memory leak for each of these
    threads, but only that it is not tidied up when DRAMA exits.

    ACMM Version 1.112