Fix tired artillery bug

[h3]Bugfixes[/h3]

• Fix bug where offensive buildings would sometimes get tired and stop firing
  
• Fix bug where mortar shells would magically pass through attack boats on fast forward speed
  

[h3]Balancing[/h3]

• Reduce Eagle builder bay build speed bonus from 15% to 10%
  
• Reduce Eagle hit points from 2,800 to 1,800
  
• Reduce artillery build time from 180 to 120 seconds
  
• Increase air turret hit points from 220 to 310
  
• Reduce deathstar laser duration from 5 to 4 seconds
  

[h3]Other[/h3]

• Make explosions look even better