v0.6 and macos support!

This update is focused on non essential content -- mostly cleaned up AV stuff. That being said, the pirate difficulty ramp has been improved. And hopefully you'll be dealing with ammo a bit more from now on. Cheers!

Full changelog:

• Reduced ammo capsule capacity
• Animated ammo capsule consumption
• Ammo capsules now explode when exposed to power
• Ammo capsules now behave like wrenches when empty
• Pirate events are now more deterministic
• Pirate events now ramp up in difficulty over time
• Cleaned up lighting, reflections, shadows
• Added hull breach audiovisual feedback
• Did another post pass
• Made new turret audio assets; tuned procedural filter
• Made hull breach audio assets
• Replaced hull impact audio
• Removed pirate audio (there's no sound in space)
• Animated turret barrels
• Minor cosmetic changes