Use http instead of https in gvctrl getLogin request. Gave RTP client a close method so that the conn can
be closed after we're done with the client. Put timeout on reading from the RTP client PacketConn so that
we don't hang on the ReadFrom call if the conn is closed. Closing the RTSP and RTP clients when
startRTSPCamera is returned.
Added a file called gvctrl.go which holds all exported functions, including Set,
and the options available for use with Set. This file also holds important consts
and the settings struct. Also added a file called request.go, which houses 3
functions that are in charge of creating HTTP requests, firstly to get the log in
page from which a log in request body can be generated, then to submit the generated
log in request body, and then to submit the settings. Finally a utils.go file has
been added to house a few helper functions.
Saxon