Cold breath effect is misplaced when using vehicle turrets/cameras

[NikkoJT]

When using vehicles with remote optics, the cold breath effect appears at the position of the optic, not at the player's head position. This is noticeable on e.g. tanks; the commander's breath will appear at the commander's optic, for example.

I'm not sure how to detect this in a reasonable way, at the moment. It works fine for non-optic seats.

One option is to just not do the breath when in any vehicle. Say the AC is working well or something.

[SamLex]

Testing on dev (06ff60f) - PASS

• In non-dedicated MP with a mission created directly from the template:
  • Cold breath doesn't appear in vehicles, as expected
  • Cold breath applies to units that are spawned, as expected
  • Cold breath can be disabled by setting f_var_coldBreathLoop to false globally, as expected (quirk - if you then set it to true, cold breath then only applies to newly spawned units. But this seems acceptable/unlikely to come up)