Changes to permit compiling in MSVC++ Successfully 

Sean,
Mike [Rasbats] has figured out how to get this to compile in MSVC++ and we are very appreciative. I have just duplicated and tested the results.  This works with Opencpn Version 3.3.1117 which was the version it was compiled on. I am going to upload the dll to Opencpn Beta file thing as weatherfax_win32_pi09_ov331117_pi.dll.

I hope you will include these changes in this pull request (two commits, both needed).

You certainly have improved the interface and this plugin will be very useful for weatherfax via ssb, radio, internet, mail!  Awesome.