Fix Titan Assist not tracking properly

[Zanieon]

Titan Assist medals aren't given to players who assisted damage when someone kills a titan, that is due the fact that Titans stores damage history in their Soul component, not the NPC itself, probably due to how game handles pilot/auto-titan interaction with the Titan entities.

I know it's ideal to PR for every single minuscle thing, but with this i also fixed the stat tracking of assistances done with weapons for progression unlocks, only because it all resides inside the same block of code that i needed to change for this whole fix. - split into #746

[ASpoonPlaysGames]

Honestly, I'm not a fan of handling assist stats in _score.nut. I would prefer if the awarding of assistsTotal that is already done in _stats.nut was updated to handle this edge case. I'm probably going to make a PR for this stats change.

The other change looks good at first glance though. I'll approve this PR once the stats stuff has been either moved or removed from this PR

[Zanieon]

Done, stat tracking removed from medal code.

[ASpoonPlaysGames]

Code changes look good :)

[GeckoEidechse]

Did anyone test this? ^^"

[Zanieon]

Did anyone test this? ^^"

Sorry, i did, before and after the request changed by Spoon, hence why i changed label ready to merge. Ill comment that i tested when labelling PRs as ready to merge if they need to be re-tested after changes from suggestions.

[GeckoEidechse]

Did anyone test this? ^^"

Sorry, i did, before and after the request changed by Spoon, hence why i changed label ready to merge.

Awesome, thanks for confirming <3
Usually we would also get someone else other than the PR author to test it to prevent a "works on my machine" moment, though I'd be fine with skipping that for this PR if we want to ^^

[GeckoEidechse]

@Zanieon said it should be fine to merge as is.