Adjust military/police magazines

[Holli-Git]

Summary

Bugfixes "Adjust police/military magazines"

Purpose of change

Currently, large capacity magazines like drum mags can spawn inside military and police locations, despite those not being used.

Describe the solution

A) Removes some rare magazines from mags_milspec and adds the M14 in, as that magazine is still in service. Removes APC9 mags as there's a very low amount of them inside, removes the smaller mags, larger mags, and some Rivtech magazines.
B) Removes drum mags and extendos from arsenal.json, as those aren't in service.
C) Removes the MP7 from police armories. MP7s aren't in any NE police branch that I'm aware of.

Describe alternatives you've considered

Testing

Loaded into a world, didn't see any MP7s or drum mags in itemgroup testing
This is stanag_mags

Additional context

I was gonna do this in #75925 but figured it would be considered scope creep

[Hyperseeker]

Just to sanity-check this: would removing stuff from item groups reduce the spawn of the magazines removed, overall?

[Holli-Git]

Just to sanity-check this: would removing stuff from item groups reduce the spawn of the magazines removed, overall?

No, unless it was a collections subtype of itemgroup