Implement `damager` filter

[calcastor]

ProjectAres had a damager filter, which OCN used to filter damage from fireworks in its global include. This would be helpful for doing the same for modern PGM, and for other applications.

[Pablete1234]

Main if not only use-case for this was disabling firework damage in modern, which was already implemented in #1445 so there's little point to it