Option to match titlebar color with window color (as was possible with SierraBreeze)

[CavaleriOmar]

It would be an interesting and graphically useful option to be able to match the color of the titlebar with the window, for all those that do not follow the system theme (like Bitwarden, for example), without having to resort to a modified colorscheme for each of them (feasible, but tedious to do for each application)