migrating conversion modifiers from JetCore::Global to MString.

testing/mstring_test.cpp

@@ -94,6 +94,9 @@ int main(int argc, char **argv) {
    int test29 = 402;
    test28 = test29;
    std::cout << "int: " << test28 << std::endl;
+
+   coreutils::MString test30 = "ABCDEF";
+   std::cout << test30 << " to hex " << test30.toHex() << " from hex " << test30.toHex().fromHex() << std::endl;
    
    return 0;
 }