Allow multiple primary weapons on ship

[sfiera]

Ares ships have three weapons: beam, pulse, and special. EV ships fire multiple primary weapons at once. It’s possible for Ares to mimic EV’s primary weapon behavior by creating a combo weapon with multiple projectile types but there are some limitations to this. A combo weapon has a single fire time and ammo pool, and cannot mix ammo/energy.

I don’t think it would be difficult to allow an Antares ship to have multiple primary weapons. The difficult parts would be:

• Teaching the AI. Should it fire based on its longest, shortest, or average range?
• Displaying ammo, if there are multiple ammo-based weapons (maybe this is rare and doesn’t matter)