Town Network: Fix issue with DEBUG defined and empty town_array entries

Thanks to sraboy for finding this error
VgaSDL: Fixed handle_messages() to once again handle window messages

The game should once again pause when it loses focus and continue when focus is regained.
Disabled the pausing on mouse enter&leave, because this did not work well with windowed mode without mouse grab enabled.

Thanks to sraboy for noticing there was a problem there.
Main menu's: The games main menu's now correctly respond to exit requests, such as closing the window
Merge branch 'tn-fix-24-12-2013' of https://github.com/MicroVirus/7kaa into MicroVirus-tn-fix-24-12-2013
Merge branch 'sdl-event-handling' of https://github.com/MicroVirus/7kaa into MicroVirus-sdl-event-handling