Cookoff - Add gradual ammo cook-off

[johnb432]

When merged this pull request will:

• Removes ammo from magazines as they are cooking off.
• Requires Cookoff - Mini-Rewrite #9758.
• Requires 2.18 for MP support (see https://feedback.bistudio.com/T79689).

• TODO: Check if pylons might pose a problem.
• TODO: Redo MP testing with latest commit.

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