don't permit using CEF builds that will have encoding problems with slot...

don't permit using CEF builds that will have encoding problems with slot saves; we assume UTF16 strings.

FCHost/fchost/fchost_storage.cc

@@ -5,6 +5,8 @@
 #include <memory>
 #include <vector>
 
+static_assert(CEF_STRING_TYPE_UTF16);
+
 namespace fs = std::filesystem;
 
 namespace {