move most of the files from esm to esm3, keep common code in esm; this is make space for a future with esm4

esm typo

esm typo

components/esm3/containerstate.cpp

@@ -0,0 +1,15 @@
+#include "containerstate.hpp"
+
+void ESM::ContainerState::load (ESMReader &esm)
+{
+    ObjectState::load (esm);
+
+    mInventory.load (esm);
+}
+
+void ESM::ContainerState::save (ESMWriter &esm, bool inInventory) const
+{
+    ObjectState::save (esm, inInventory);
+
+    mInventory.save (esm);
+}