Support for changing the HTTP server port and IP via Settings.cfg

- Some stale comments were in Settings.py for ip_httpforward and
port_httpforward. I changed those to ip_httpserver and port_httpserver
respectively as those seem a little more descriptive and probably what
those were

- Per above, two new settings for ip_httpforward defaulting to blank
string (let HTTPServer decide) and port_httpserver defaulting to 80.