Smoother rendering of team logos
Better backgrounds
Improved comment about kickOffTeam
differentiate between sending and listening port

For local testing it can be very helpful to have the gamecontroller send and
receive data on two different ports. Ideally this can be set via the command
line, however for now the GameControlData class constants can be adjusted.
Improve rendering of start UI.

The background image is hidden when a team which has a custom logo image,
allowing the logo to appear without any distracting and mostly occluded
image behind.

This also better supports PNG logos with transparency.
Improve Bold Hearts team logo.