Explosives - Improve AT, SLAM and Claymore Mines

[mrschick]

When merged this pull request will:

• Reduce the trigger mass of M15 AT Mines to a realistic value of the M603 pressure fuze:
  Previously they would only trigger at >7t, keeping Wiesel Tankettes (~4t) completely safe. Now they will detonate under any vehicle heavier (>300kg) than the vanilla quad bike (280kg).
• Improve the M4 SLAM mine's damage dealt to soft and hard vehicles:
  Previously it wouldn't destroy cars and barely damage trucks (while killing the crew only in side-attack mode). Now it can reliably destroy them in both bottom and side-attacks, while also dealing slightly more damage to armored targets.
• Make Claymore mines less destructive towards buildings while adding ACE Frag effects to compensate:
  Still needs to be tweaked and tested a bit in various conditions as to not end up reducing ranged damage.

Changes are based on and require #9728.

[mrschick]

@BrettMayson FYI, the duplicate class definition that I fixed with 581a62e was detected by the PR's pipeline and threw an error, but is not logged as an error by HEMTT v1.12.4.

[lambdatiger]

Noticed you're basing your PR from this PR #9728. Sorry if I threw a wrench in any of your work, there were some issues with using init event handlers until we get getShotInfo. I fell back onto the old event driven system, but the final effect shouldn't differ. The changes you made to addons/frag/CfgAmmoFragParameters.hpp shouldn't conflict, but I thought I should give you a heads up that you might have to fight another merge conflict.

Also question, should your WIP claymore produce some of the 700 fragments spread in every direction, or just forward?

[mrschick]

Thanks for the heads-up. Don't worry about it, I just need your excellent changes as a base to test explosive improvements, merge conflicts are only a minor hurdle while this PR is WIP anyway 👍🏻

My goal for the Claymore is to reduce its damage against buildings (without tweaking overall damage too much) and ideally get it to generate a realistic frag pattern, which includes a bit of shrapnel to its rear, since it has a rear danger zone of <1m right now.
Not completely sure how to set the gurney value to interact with explosionAngle to throw shrapnel mainly "forward" of the mine.