Hearing - Remove deafness from vehicle secondary explosions

[Dystopian]

When merged this pull request will:

• remove deafness from vehicle secondary explosions;
• exclude fuel (both tank fuel and cargo fuel) from the explosion power calculation;
• fix cargo ammo in the explosion power calculation when ACE Rearm is enabled.

AFAIK, fuel does not explode when a vehicle is destroyed. It burns, but it does not produce a loud explosion.
A secondary explosion from a vehicle without ammunition is not loud enough to cause deafness. There may be occasional pops from burning tires or pneumatics, but there is no actual explosion.
Since ammunition explosions are already handled by cookoff, secondary explosion deafness should be disabled.

When ACE Rearm is enabled, getAmmoCargo returns 0 for every rearm vehicle. This causes _ammoCargoPower to be 0 as well. This is now handled by treating the value as 1 instead.