Build as separate plugins under windows

[devernay]

There is a request to build as separate plugins rather than a single multibundle under windows, for use in other OFX hosts (Resolve, Fusion...). That way, plugins can be copied individually.
I don't have windows, so I cannot do it, but I can help if someone gets stuck on this.
Basically, you'll find all the information about what file is required for which plugin in the Unix Makefile found in each subdir of the source tree.

If someone does this, please contribute the vcxproj.

[yueda1984]

After I followed #70, I managed to build the plugins. Now I would like to find an easy way of building each plugins separately for the convenience.
As long as I learn the way, I don't mind doing the tedious job of building all plugins and then sharing so other users can just grab them.