Declare handle::detach()

It's trivial and used at the point from which no C++ exceptions are
expected, as the handle is no longer a subject to RAAI.

Signed-off-by: Simon Rozman <simon@rozman.si>

include/WinStd/Common.h

@@ -1098,7 +1098,7 @@ namespace winstd
         ///
         /// \return Object handle
         ///
-        handle_type detach()
+        handle_type detach() noexcept
         {
             handle_type h = m_h;
             m_h = invalid;