Beta 4.25.62

Bug fixes:
Fixed Enemy firing many missiles at once suddenly.
Changes:
Player now gets points for taking down the Boss Shields, and for each Turret.
UFO Changes direction more often in later waves.
Missile Enemy now can shot more than one at a time. Starts out with more delay than before, but lessons each wave.
Mine Enemy mine drop more often, starts out less often than before.
Missile now has sound when active.
PowerUp time is now additive.
Removed Player homing mines going after fighter/fighter pair.
Increased the range and speed of player homing mines.
Enemy One that fires missiles, now can spawn more than one at a time in later waves.
Death Star now spawns at random location, direction.