[IMPROVE] Closing chart windows using keyboard shortcut "command + w"

[LinusKaiser]

As many people are used to navigating their computers primarily by their keyboard, it would be very nice to be able to close the chart windows via keyboard shortcuts. I'm not sure whether this works already for windows and intel macs, but it doesn't yet work on my m1 mac. Being able to close the window via "command + w" like in other applications would improve the workflow very much.