feat(balance): adjust relative damage values of rockets yet again

[chaosvolt]

Purpose of change

Turns out the M72 LAW had some inconsistencies to it and also got overlooked by #2381, but while looking at it I realized my buffs to 40mm are kinda wildly out of line and make balancing the other anti-tank ammo harder.

Describe the solution

1. Toned down 40x46mm and 40x53mm HEDP a bit so we have less need to make the direct damage of rockets so much higher, from 200 and 250 down to 125 and 145. This puts them at a bit about their buckshot loads in terms of raw ballistic damage.
2. Fixed M72 rockets having literally half the direct damage of M202 rockets, increasing damage from 30 to 150. This makes it slightly better than 40x53mm in terms of raw impact and a bit better overall due to it having the bigger boom.
3. Updated RPG-7 rockets to cover a different range of damage accross the main anti-tank variants, changing the range from 100-200 to 160-200 (excluding thermobaric, which was allowed to stay at 60) and setting. Also set them to consistently use armor_multiplier instead of arpen, matching what M72 and ATGM rounds use.
4. Bumped 84mm up from 100 base damage to 175, making it consistently a bit better than baseline RPG rounds while still lower than tandem rockets. Also set the HEAT variant to use armor multiplier instead of armor penetration, retained arpen for the other versions.
5. Gave ATGM rockets the base damage of 250 that 40x53mm previously used.
6. Fixed the weight of a packed M72 LAW not matching the combined weight of an M72 plus one shot. Because I know @scarf005 likes to scream about weight unrounded gram weights in our item folders, I rounded the weight of M72 rockets down to nearest hundred grams to make the resulting weight of the packed LAW also a neater-looking about.

Describe alternatives you've considered

Screaming because balance is still hard.

Testing

1. Checked affected files for syntax and lint errors.
2. Did basic addition to confirm the weight matched.

Additional context

Checklist