Cleaned up std includes because std is no longer private to fs.

src/ox/fs/test/filestoreio.cpp

@@ -5,7 +5,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
  */
-#include <ox/std/_strops.hpp>
+#include <ox/std/std.hpp>
 #include <ox/fs/filestore.hpp>
 
 using namespace ox::fs;