updates spawners + reach and centcomm

[Flareguy]

About the PR

Further refines the item spawners. There is now a separate group for utility items & ammo, and significantly more weapons available. Effectively, almost every viable weapon that isn't total dogwater or completely unfun to fight has been added to the pool.
Ammo rarity being weird has been fixed (no more random caseless mags and antimateriel spam.)
The Nuclear Option has been re-introduced, but is now much rarer.

Updates reach & centcomm to add the new spawners. I don't feel like doing train right now.

Why / Balance

more weapons = more variety
more granularity with spawners = more balanced ammo & utility spawns

Technical details

N/A

Media

N/A

Requirements

• I have read and am following the Pull Request and Changelog Guidelines.
• I have added media to this PR or it does not require an ingame showcase.

Breaking changes

Changelog
🆑

• add: Further enhanced item spawners. Utility items & ammo should now spawn in a more balanced manner, and almost every reasonable-to-add weapon in the game is now available.
• fix: Caseless mags will no longer spawn in the ammunition pool.