Hi everyone,

Run some few test on already existing std string and made some few fixes.
We do not have to explicitly instantiate with basic_string!char again as we can now use std_string. Using "std_string" was not allowed yet because we had the symbols emitting to druntime and we didn't want that. Now that STL interop has been moved from druntime, we are free to use that.

Lastly, I faced a misleading pragma message indicating that the new __cxx11 string implementation not yet supported. I took time to work on that to make it work only to realize it had been implemented already. The pragma message was to be cleared. it's now commented out. Still running more test to be very sure that all that has been implemented work very well. Then I guess I will be moving to next containers.

Thanks.