handle internationalized strings on windows

[AddressXception]

Bug Report

Expected Behavior international character sets are handled in utf-16

Actual Behavior when marshalling strings from c# to the native library, the character set is misinterpreted. likely due ot the use of wide string and converting to string.

steps to reproduce:

netframework ManifestGenerator uncomment one of the lines that includes spanish language. set a break in the Manifest.h c++/cli wrapper constructor after Utilities::MarshalString(json, _json);

expected: the string is properly translated actual: the string has extra characters

Environment

• OS: [e.g. OSX 10.13.4, Windows 10]
• Version: [e.g. 1.0.1]

[AddressXception]

the dllimport calls probably need the charset explicitly set