Items & other progression

[jukkae]

• [x] Good items should be more difficult to get
• [x] Iodine is sort-of required by now
• [x] Food availability?
• [x] More items?

[jukkae]

Yep, needs a lot more shielding against radiation. First few levels are survivable, then gets basically impossible.

[jukkae]

• [x] Fake stimpaks indistinguishable to the player

[jukkae]

• [x] Don't immediately die from hunger

[jukkae]

More items left for future releases

[jukkae]

Finished in https://github.com/jukkae/rascal/commit/835bcd522e267d01d3ac38b204b6f4a353817263