SE761: Fixed button settings for victory screen

Fixed yaml file settings for button and message to appear on the end
victory screen. Worked with Stanley.
SE761: Wrote in method for victory screen panel

Method loads the end victory screen panel using the yaml file settings.
Screen appears on the last campaign saying the game is won, a quit
button takes you to main menu. Worked with Stanley
SE761: New method to get last map, isLastMap()

This method goes through the campaigns played and works out if there is
another map to load, gives a boolean value. Worked with Randolph and
Stanley.
SE761: Merge conflict hopefully resolved