* Needs a real icon for opening (borrowed sprite-info icon). The open
    icon needs to be moved from current location of underneath stage to
    same row as control buttons (start/stop vm).

  * The zoomed mode loses the ability to drag sprites. Haven't had
     a change to look into this yet.

Add class name props to the components, and fix positioning for the green flag to be reusable.

Still missing is a green flag, but blocks run!

This way one can still get the benefits of the GUI container but have a custom collection of components within it.

This shouldn't be required.

This way a stage is not necessary for sound blocks to work