Update cVszArchive.cls to add Unicode Support to "Addfiles"

[Hobbybyte]

Added Unicode Support for Creating Archives
Changing FindFirstFileA to FindFirstFileW in Function AddFiles

Thanks for creating and sharing such a great vb code

[wqweto]

Current WIN32_FIND_DATA declaration uses String members which get ANSI<->Unicode transcoded which is a problem for Unicode API functions (like FindFirstFileW) which do not need any transcoding to happen at callsite.

To prevent this auto-transcoding the last parameter of FindFirstFile API declare should become ByVal lpFindFileData As Long and callsite should use VarPtr(uData) for actual argument.