Currently, drop-down menus (children on BaseMenuHandleView) could be cut

off depending on the size of the browser/screen. This change makes the

lateral positioning of the menu responsive so that the full width of the

menu is always visible on screen. If the menu element is being cut off

on the right, the entire menu is moved to the left so that it is on

screen. We also ensure that the menu width is never bigger than the

width of the window, and that the menu can't be cut off on the left.

Tested resizing the browser window in storybook, saw that the menus

in MenuButtonView and MenuLabelView positioned themselves correctly.