Fix tired artillery bug — Battlecruisers Steam update #511254

Bugfixes 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 Balancing 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 Other Make explosions look even better