Implement HTTP transport layer wth TLS

Current plan is to use libcurl + WolfSSL, with LibUV as a command eventing layer for all networking code.

The alternative to libcurl is lws (libwebsockets) but for plain GET / POST, Curl or the CPR wrapper will yield simpler code. Since we are not going to recommend using HTTP and JSON for high performance use cases most often used with C++, not a priority.