Improved mining droprates

"Balancing mining is so hard!"

This is a PR that you really need to look at the code to understand the changes, but it's not exactly a hard thing to figure out.

- Reorganized equipment locker
- Buffed default chance mineral droprates (west asteroid)
- Buffed low chance mineral droprates (east asteroid)
- Removed iron from high chance mineral droprates (turfs that are scattered throughout west asteroid, these should not be iron at all)
- Reweighted all the mineral turfs to be properly balanced based on mineral rarity and usefulness (fighting blobs isn't a pain in the ass now

You can mine effectively on both sides of the asteroid, with the west asteroid providing more minerals at the expense of potentially running into mobs in caves. You can monster hunt if that's your thing but mobs won't be so prolific and you probably won't run into dual goliaths, at least you shouldn't. You can be passive during slow rounds and mine on the east asteroid if you're some kind of pussy or a new player.

The separation of east and west asteroid should be a lot more clear, especially on the wiki. I might update the mining guide on the wiki to more urgently communicate that the east side of the asteroid is already NT-controlled and wildlife-free, while the west side is unexplored and dangerous for new players.