Should provide projectile / shooting specs to agent

[netgusto]

Agent should know the specs regarding its firepower:

• projectile speed (in m/tick)
• projectile range (in m)
• energy cost of 1 projectile
• cooldown time between shots (in ticks)
• projectile damage when hit

[netgusto]

Agent shooting specs is now passed in specs:

{
...
    "maxshootenergy":1000,
    "shootcost":200,
    "shootrecoveryrate":10,
    "shootcooldown":3
}

[netgusto]

Done. API changes will be detailed in changelog.md