Werror: Enable warnings as errors

Added C/CXX warning messages similar to MRAA (w/ -Werror).

    * Added syslog warning for missing switch cases
    * Cleaned up uint vs int usage
    * Fixed redifinition errors for C structs
    * Added virtual destructors for base classes
    * Removed redundant CMAKE_CXX_FLAGS from COMPILE_FLAGS for all three
      wrapper languages.  The CMAKE_CXX_FLAGS were showing up twice in
      the compile commands for the wrappers.
    * Added CMake WERROR option to enable/disable warnings as errors for
      all targets.
    * Disable a handful of compiler warnings for the wrapper cxx files,
      this minimizes the number of warnings from auto-generated code).

Signed-off-by: Noel Eck <noel.eck@intel.com>

src/bacnetmstp/bacnetmstp.cxx

@@ -27,6 +27,7 @@
 #include <stdexcept>
 #include <string>
 #include <sstream>
+#include <syslog.h>
 
 #include "bacnetmstp.hpp"
 #include "handlers.h"
@@ -503,8 +504,10 @@ bool BACNETMSTP::dispatchRequest()
                          << (int)m_invokeID << endl;
 
                   break;
+                default:
+                  syslog(LOG_WARNING, "%s: switch case not defined",
+                          std::string(__FUNCTION__).c_str());
                 }
-
             }
           else if (tsm_invoke_id_free(m_invokeID))
             {