[Vanilla Enhancement] Improve occupants firing logic

[NetsuNegi]

In rulesmd.ini:

[CombatDamage]
FixOccupyFire=false         ; boolean
UseGlobalOccupyRange=true   ; boolean

[github-actions]

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此拉取请求已在 Phobos CN 上被提及。那里可能有相关详细信息：

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[Metadorius]

the docs say nothing, did you forget to write them?

[DeathFishAtEase]

Document, but draft.jpg

Additionally, FixOccupyFire is actually used to enable a new garrison firing system, but this INI name sounds like it fixes some kind of bug.

[Metadorius]

ah, good old "proper garrisons with individual ranges/verses". was the second thing I tried to do when we were starting Phobos, and I concluded it wasn't worth it

I don't really mind, but it's a pile of hacks on top of vanilla pile of hacks. wouldn't it be better to further extend OpenTopped?

[TaranDahl]

ExtendedOccupyFire

[Metadorius]

for reference: #1879