Hearing - Improve and cleanup code

[johnb432]

When merged this pull request will:

• Use magazines for determining combat deafness.
• Use code from ace_gunbag_fnc_isMachineGun to detect if a weapon is a machine gun.
• Improve the caching by
  • using the magazine name only, as initSpeed relies on the magazine and ammo can't change during play time for a magazine
  • switching to a hashmap
  • making a dedicated function
• Code cleanup.

I've tested it, but I want someone who uses ACE hearing to also test it, as I don't usually enable ACE hearing.

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