Command Line option to run v1 or v2 gui

[damies13]

For Version 2 development we need a command line switch to control which GUI to use, this should be left in place for v2.0 as a fall back in case there are major bugs in v2.0, and removed for v2.1 release.

• When running v2 GUI should launch with web GUI and port 8138 open using new web server, port 8139 old web server
• When running v1 GUI should launch with tkinter GUI and port 8138 open using new web server, port 8139 old web server

[damies13]

This is per-requisite to developing new GUI (Issue #247 )