#121 darkmode

[xbit ops]

i know another ticket has been open for some time requesting the ability to change the default syncterm colors just like we could w/ the retro com programs. this is a request to just add a darkmode for now to help with bright screens in dark rooms. attached is just an example.

[Stephen James Hurd]

Added an option to change the colours. Not exactly "themes", but maybe good enough?

[xbit ops]

Works. Thanks!