Fixing merge conflict with csproj file
Cleaning up #includes in C++ code

Also updating Visual Studio solution file to build correct projects in
proper platform/configurations.
Updating json-cpp lib and replacing mongoose web server with civetweb.

The Mongoose project has changed its licensing to GPL. This change
replaces Mongoose with Civetweb, a fork of the Mongoose project at the
last commit under the previous license. Civetweb is licensed using the MIT
license.

Additionally, the JsonCpp project has moved and changed owners. It now has
a much simpler method of source code incorporation into additional
projects. See the README for information about how to generate the code
included here.