Changed format_windows_error to not need LocalFree

Define FMT_NOEXCEPT empty when exceptions are disabled

* Fixes warnings about disabled exception support in MSVC

This is for non-'Desktop' applications that have a
more limited collection of functions.

Fix switch fall-through warning

Clang with `-Wimplicit-fallthrough` enabled shows a warning here without
the break.

Extend CI tests with older c++ standards

Given that it is required for header only builds it has to be
installed too.

This informs travis that the container-based build environment can
not be used.