class ProjectileType bool homing real arc string sfx real speed FunctionCallData onImpactFunc

construct(string sfx, real arc, real speed, bool homing, code onImpactFunc)
    this.sfx = sfx
    this.arc = arc
    this.speed = speed
    this.homing = homing
    this.onImpactFunc = new FunctionCallData(onImpactFunc)