[Feature Request] Fullscreen mode

[benkl]

I cannot find any documentation about fullscreen mode.

• p5js fullscreen() is not supported.
• The F11 key to switch GLFW fullscreen returns: cannot change fullscreen mode for glfw backend
• setting vispy to call app.canvas with fullscreen=true returns an access violation. Settting fullscreen to 0 works but there is an offset of the image and the input .

[ReneTC]

Another enhancement related to this I think is helpful is resizing the output window.

For example I would like to use p5 to output 4k resolution images - but without a 4k display you can't see what's going on