Menu GUI updates

Photoshopped new borders for GUI menu elements
Updated wave setup menu
Updated skirmish menu
Updated base assault menu
Updated Hunter Seeker description
Updated the unlocked ships menu visuals and borders
Changed background color to blue of unlocked ships menu
Changed campaign select background to blueoptiontwo
Added @Admiral Algor (GMT+3) @Admiral Atrixsanna and @Admiral Brackman (CEST) to the credits
Added the text 'Select a ship to display its statistics' in the top menu of the unlocked ships screen