Feature request: VNC server with display-nr and geometry

[S1GN3T]

The current VNC server block only starts VNC server. This is perfect if you have a HDMI monitor to use.

Though this is uncomfortable for headless pis, because you only get the minimum resolution of 600xsomething via VNC viewer. This resolution can't display e.g a complete terminal windows.

My suggestion is to use another block that provides something like this:
vncserver [:display] [-geometry widthxheight]

This way you can already define certain display ports and resolutions.

(If i have enough time, i will try this myself and provide it late on, if successful)