Frag - Add Submunition Fragmentation

[lambdatiger]

This PR is based on PR https://github.com/acemod/ACE3/pull/10157 and requires it to be merged. This may need to be changed once https://github.com/acemod/ACE3/pull/10163 is merged.

When merged this pull request will:

• Makes the function shouldFrag check whether a projectile's submunitions would frag and adds relevant event handlers if they would.
  • Currently no explicit recursion checks because Arma should fail to with recursive self-referential submunitions.
• Adds child function to initialize fragmentation to be called by both fired and submunition spawned event handler.

As always, feedback desired.

TODO

• [ ] Double check that Arma 3 does not accept self-referential submunition loops.

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