Add proxy support to the http library for secure https transactions

[aartjan]

I created an application that talks to a SOAP webservice. Unfortunately the NI HTTP does not support https behind a proxy (using the connect method). See this thread. It is unfortunate, since the curl library underneath is much more powerful. I have to overhaul my code to implement another solution.

Encrypting http transactions with configSSL.vi is cumbersome as well. The documentation on this VI could be much better.