Added Several More Difficult Encounters - Still Alpha Testing

* heavy attack warship launching several torpedos at once
* heavier torpedos
* large grid patrol fighter with torpedos
* small grid patrol fighter with heavy armor and torpedos
* big-small grid patrol with heavy armor and requesting backup squads
* squadrons consist of more difficult small fighters
* torpedo station does its thing (first advanced station encounter)

Initial Encounters:

* cargo ships that turn and fight if player is close and release drones and request fighter support
* stations that launch fighters and drones
* stations that shoot torpedos
* small fighter patrols
* big-small grid patrols that request fighter backup
* heavy warship patrols that fire torpedos and spawn drones