Commented out adding the GroupManager, for now.

Doesn't work is the problem, and I know why.

Signed-off-by: Ken Hoover <ken.hoover@mail.utoronto.ca>
Added Grill stage background.

Signed-off-by: Ken Hoover <ken.hoover@mail.utoronto.ca>
Added generic button, along with 2 variants of it.

Also added left/right buttons for order-sheets, and a button to indicate
which someone's looking at.

Signed-off-by: Ken Hoover <ken.hoover@mail.utoronto.ca>