Explosives - Use triggerAmmo instead of setDamage

[johnb432]

When merged this pull request will:

• Title.
• This would allow explosives that can't be triggered by damage to exist. The APERS mine dispenser is one of those with these changes.
  Do we want the APERS mine dispenser not to explode when destroyed?

TODO:

• Test in MP (if triggerAmmo needs to be local) - needs to be local
• Test if setShotParents/getShotParents still works - tested with a dedicated server and everything works as expected.

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[LinkIsGrim]

Do we want the APERS mine dispenser not to explode when destroyed?

Only if it's empty potentially?

[johnb432]

Only if it's empty potentially?

APERS mine dispenser can't be empty, When it's triggered, it creates the submunitions and deletes the dispenser.

[johnb432]

I'll make another PR for making the APERS mine dispenser trigger when destroyed, as to keep things separate.