Finish modernizing volume and weight

[hexagonrecursion]

Summary

SUMMARY: none

Purpose of change

Contributes to #36110

Describe the solution

Convert the remaining weights and volumes to strings.

Describe alternatives you've considered

none

Testing

1. The game loads
2. The weight and volume of the .50 caliber rifle remain the same
3. The weight and volume of the sawn-off .50 caliber rifle+1 remain the same

Additional context

This change was brought to you by the following script (mostly because I wanted to learn more about jq)

#!/usr/bin/env bash
# usage: ~/fix.sh ./tools/json/json_formatter.cgi
shopt -s globstar
JSON_FORMATTER=$1

# Create a rebase "upstream" to filter out the noise introduced by jq
git checkout -b modernize-volume-weight-noise master
for FILE in data/json/**/*.json; do
	echo "noise: $FILE"
	jq '.' "$FILE" | $JSON_FORMATTER | sponge "$FILE"
done
git add .
git commit -m 'DO NOT MERGE'

JQ='
(
  .[] 
  |
    (select(.type=="GENERIC" or .type=="GUN" or .type=="WHEEL") | .relative.weight),
    (select(.type=="trap") | .trigger_weight)
  | numbers
) |= if .%1000 == 0 then "\(./1000) kg" else "\(.) g" end
| (
  .[]
  |
    (select(.type=="GUN") | .relative.barrel_length, .relative.volume),
    (select(.type=="vehicle_part") | .folded_volume)
  | numbers
) |= (./4*1000 | if .%1000 == 0 then "\(./1000) L" else "\(.) ml" end)
'
git checkout -b modernize-volume-weight modernize-volume-weight-noise
for FILE in data/json/**/*.json; do
	echo "$FILE"
	jq "$JQ" "$FILE" | $JSON_FORMATTER | sponge "$FILE"
done
git add .
git commit -m 'Finish modernizing volume and weight'

After running the above script run:

git rebase --onto=master modernize-volume-weight-noise modernize-volume-weight

Notes: the script is more complicated than it could have been because of an inconsistency in the json formatting: json does not distinguish between 123.0 and 123 and the game data currently uses both. jq turns 123.0 into 123. Ideally in the future json_formatter.cgi would normalize the representation of numbers.