feat(balance): round ~1 pound to 400g, 500g

[scarf005]

Purpose of change

• #2505

metricate item weights, part 1.

1. many items weighted around a pound to depict them as 'somewhat heavy'.
2. it could have been weighed 500g or 400g instead.
3. eradicate trace of customary units from the game because SI units are superior in many ways (easy to reason with, used by many, etc)

Describe the solution

replaced all items weighting 450 ~ 500g to 500g, and items weighting 400 ~ 450 to 400g.

Describe alternatives you've considered

making them all 500g to be nice and simple.

Testing

passed automated tests in local environment.

Additional context

~98.4% of existing countries have fully adopted metric system (192/195 countries, with the exception of Liberia, Myanmar, and the United States.)

[RobbieNeko]

Looks to me like a couple chemicals and firearms got caught in the crossfire when in actuality they've got pretty accurate weights that are still nice rounded numbers regardless

(Also, in hindsight I totally should have just done a single review, but I initially came in only expecting comment on one thing before it turned into 3 haha)

[VissValdyr]

While not in the 500 but rather in the 1500 range, books need some help as well.

{
  "type": "BOOK",
  "name": {
    "str": "Internal Combustion Fundamentals",
    "str_pl": "copies of Internal Combustion Fundamentals"
  },
  "description": "A college-level textbook that details the operation, maintenance, and repair of internal combustion engines.",
  "bashing": 4,
  "material": [
    "paper"
  ],
  "symbol": "?",
  "looks_like": "story_book",
  "color": "blue",
  "flags": [
    "TINDER",
    "FLAMMABLE"
  ],
  "id": "book_icef",
  "copy-from": "base_book",
  "weight": "1587 g",
  "volume": "1500 ml",
  "price": "5950 cent",
  "price_postapoc": "2250 cent",
  "skill": "mechanics",
  "required_level": 4,
  "max_level": 8,
  "intelligence": 6,
  "time": "30 m",
  "fun": -1
}