====== sentrygun ======

Slowly fires powerful projectiles at creeper, bots and digitalis in range. Used by several player units, notably [[ixe:features:units:apex_ship|Apex]] ships.

__**Arguments**__

  ?turbo (bool)
  :If true, weapon's fire rate is increased tremendously
  ?fire_range (int)
  :Maximum distance in map pixels at which weapon will aim and fire at targets
  ?rotate_speed (float)
  :Maximum turn rate of cannon in degrees per frame (in manual mode cannon rotates instantly to face cursor regardless of rotate_speed)
  ?fire_cost (float)
  :Ammo consumed from parent unit per shot fired
  ?fire_delay (int)
  :Time between shots in game frames
  ?shot_speed (int)
  :Movement speed of fired shots in map pixels per frame
  ?max_age (int)
  :Time in game frames from firing until projectile despawns (a value of 0 gives projectiles unlimited lifetime)
  ?shot_damage_count (int)
  :Maximum number of creeper pixels damaged per shot
  ?shot_damage_distance (int)
  :Maximum damage radius of shots in map pixels
  ?shot_damage (int)
  :Damage to each pixel of creeper (negative values damage creeper, positive values damage anticreeper; however, there is no way to target anticreeper)per shot, in millionths (i.e. -1000000 reduces creeper depth by 1.0 in each affected pixel)
  ?shot_digitalis_damage (int)
  :Damage to each pixel of living digitalis per shot (damage is always inflicted in a 5x5 pixel square centered on the point of impact, regardless of shot_damage_count or shot_damage_distance)