Todo

• Figure out more intelligent way to blit
• Figure out better way to zoom
• Ideally, grab a sub-surface of the area that will be visible and only scale that piece
• Makes sense to squash the layers before zooming
• Make a controller class to get controls out of 'Main'
• Be more intelligent about placing rooms
• Entrance should be the first room placed, so it's in the center
• Exit should be the last room placed, so it's along the edge
• Place other features