Add enemy cargo ship

[LordDeatHunter]

Bulky ship with a lot of HP that has a lot of nice drops.

[cdsupina]

Seems way to hard to destroy the cargo hauler at the moment. Maybe we need to make sure that this wave only spawns at later levels. Or for now just reduce the health.

I'll test it again after the weapon pr gets merged in and then we can balance it from there

[LordDeatHunter]

I was considering lowering the health a tiny bit, and the spawn-rate even further for the 1st stage.

The main issue is when the cargo ship appears. If it's the first wave (which I've had happen), then you're pretty much powerless against the wave. If it happens, say, right after the first boss, then you can take it down way too easily.

Another idea (unrelated to the current solutions, could be a follow-up future topic), a way to give mobs "modifiers", so that they have eg. x3 HP, x1.5 DMG, etc.