[WIN32] additions to make the addon on windows with cmake

First working version. Downloading, unzipping, compiling and zipping is done with cmake and cpack. I don't know if this will work for all addons but I'm eager to get this done ;)
Still missing are vs specific compiler options like sse and other various stuff which is set inside the projects.
But this can be added later as the addons will become more "complicated"