Vehicle Damage - Code cleanup

[johnb432]

When merged this pull request will:

• Use vanilla hashmaps instead of CBA hashmaps.
• Moved EGVAR(cookoff,canHaveFireJet) = 1; to config, as the default was 1 with [_configOf >> QEGVAR(cookoff,canHaveFireJet), "number", 1] call CBA_fnc_getConfigEntry. CBA_fnc_getConfigEntry is about 2-3x more performance intentsive than the getX config commands, so I switched over to the getX commands as much as possible.
• Use a global hashmap to store vehicle hitpoints, instead of storing a vehicle's hashmap in a vehicle variable.
• Fix a case-sensitive bug: toLowerANSI hitpoint aliases, which weren't guaranteed to be lowercase.
• Renamed FUNC(addDamage) to FUNC(setDamage), as it doesn't add to existing damage, it sets it.
• Code cleanup.

This is ready for review, but it needs testing. I have tested it, behaves as it did previously.

I haven't really touched the core logic of vehicle damage, so don't expect it to be magically fixed. With help, I am willing to redo some of the logic though.

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