trench/mining rework

[zjdtmkhzt]

I definitely think that rare ores like starstone/erebite/whatever should probably be found in z5 asteroids occasionally. It makes little sense that they wouldn't be there sometimes.
Also, the trench has plenty of structures, in my opinion, but space z5 could use way more. (Of course, someone has to map those.)

-balance enemies to not take a few weeks to kill at the very least and maybe also not take you to crit in 5 seconds

Trench enemies are already balanced as is. You can quite reasonablly find a phaser and spare power cell or even two which makes disposing of said enemies pretty easy. Even with out them, you've got the mining phasers and plasma cutters.

Fighting the trench enemies just seems super unfun/boring/time consuming to me. Especially because you can hardly ever run away from them like you can from drones in space, so you just shooty shooty them until they die and then weld weld your sub until it's full again. It just feels like a time sink, especially because they seem rather tanky (perhaps because the submarine weapons are lackluster).