Support for unicode filenames

[michaeltryby]

Passing a filename containing unicode characters causes ERROR 303.

Bug reported by pyswmm user.

[michaeltryby]

One possible solution would be to use _wfopen() in SWMM on Windows.

https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/fopen-wfopen?view=msvc-160

[jennwuu]

String must be encoded using Latin-1 before passing to SWMM engine. Previously in older pyswmm versions, six.b() was used before passing to SWMM engine.

[jennwuu]

@michaeltryby is dev-unicode branch where you last worked on this?

[michaeltryby]

@jennwuu Yes that is is the branch I opened up to work on it.

[abhiramm7]

@michaeltryby looks like we can close this?