Implement MxAtomId and reference counter (stl set) (#109)

* Implement MxAtomId and reference counter (stl set)
* Partial success in hiding 4786 warning spam.
* Build out most of MxOmni::Destroy since it also touches the set

* Add some size asserts

CMakeLists.txt

@@ -92,6 +92,7 @@ add_library(lego1 SHARED
   LEGO1/legoworldpresenter.cpp
   LEGO1/motorcycle.cpp
   LEGO1/mxatomid.cpp
+  LEGO1/mxatomidcounter.cpp
   LEGO1/mxaudiopresenter.cpp
   LEGO1/mxautolocker.cpp
   LEGO1/mxbackgroundaudiomanager.cpp