ADD sandbox code for fullscreen_mode + REMOVE: spin from player (rarely used?)

[hainm]

Absolutely a sandbox code

from nglview.sandbox.grid_view import fullscreen_mode

fullscreen_mode(view) # will add a `Fullscreen` button to the player

[ostrokach]

Is there a more nuanced reason as to why the "spin" option was removed? I came to GitHub looking for this specific feature...

[ostrokach]

Ah, nevermind. As long as the feature is still available, I guess it does not matter if it is exposed through _display.

Thanks!