Fire - Mini-Rewrite

[johnb432]

When merged this pull request will:

• Contains #9991, #9992 and #9993. Wait until the above has been processed before merging this.
• If you want to burn something now, you call a targeted event ace_fire_burn (previously it was a global event).
• Fixes a bug where invulnerable units can burn. Repro steps: Go into the arsenal mission and stand next to a vehicle cooking off (advanced vehicle damage must be enabled).
• Split fire effects and simulation.
• Simulation PFH runs where unit is local ~~on every machine, but code is only executed if unit is local.~~
• The above makes fire JIP compatible for both simulation and effects (at least, looking at the code suggests it wasn't compatible).
• There was a mention of fire propagation in the code, which did not work as I expected. Changed it so that if a unit is close to a burning unit, said unit can start burning. For this to happen, the fire must be above a threshold (#define BURN_THRESHOLD_INTENSE 3, can be changed).
• Dead units can now catch fire.
• Code cleanup.

Tested in SP and MP.

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[johnb432]

I was able to test this on a dedicated server:

• Medical damage did not work on dead units, as the API function in medical doesn't like dead units. Changed it so that it uses events directly instead.
• JIP works.
• Units propagating fire between each other works.
• Fire sources work.

[johnb432]

BURN_MAX_INTENSITY is never enforced anywhere. Is it a limit that we want/should enforce?

[Mike-MF]

Can you change the burn event for SOG in this PR too? https://github.com/acemod/ACE3/blob/60eabda47e16c660911a0a98327ace33359f0e75/addons/compat_sog/functions/fnc_woundsHandlerIncendiary.sqf#L37