GUI Update request, change background colour setting

[Dexter_Whelan_SAS]

It is in fact the age of the dark background, and while maybe that is a step too far for Blue Prism though I would love it, I would at least love to have something that isn't the white light of Blue Prism studio/control room burning into my retinas ~5 hours a day. Some ability to control background would be nice, even just to mute the white light a little. Even better would be a good dark mode

[TLMartin]

Yes we need to be able to have the Dark mode as an option.