Add functionality to PlayerAssist callback

[NoCatt]

Adds a function to the player killed callback that is just a copy paste of how we handle assists everywhere else

yes this PR is untested :>

[ASpoonPlaysGames]

Very weird whitespace stuff going on here lol

Will properly review once I can tell what actually changed

[Zanieon]

Any updates on this to solve conflicts? There's some other stuff that requires changing as well before merging.

[GeckoEidechse]

Aight, I reverted all the unrelated whitespace changes via f824608 to clean up the diff

(omfg we desperately need a Squirrel formatter so this doesn't keep happening and doesn't need to be done by hand...)