Allow executing npc_pilot_elite NPCs

[NachosChipeados]

Allows players to execute pilot NPCs. Since every mod that uses npc_pilot_elite NPCs for something (see Gruntmode) , also adds similar changes to this, i think it'd be nice to bring this change into Northstar officially.

Before:
https://github.com/user-attachments/assets/489cc6f1-bc9f-4254-88a5-c30c7e30f6d6

After:
https://github.com/user-attachments/assets/b1263242-c6e8-403d-941c-8bed822ef5cc

Also added missing gib + headshot fx, to prevent weirdness.

Before:
https://github.com/user-attachments/assets/d8874ab2-fdeb-48eb-9db8-10526770f717

After:
https://github.com/user-attachments/assets/33eca4fd-3ec4-49a7-805a-024093efd068

HOW TO TEST:

1. Spawn a pilot NPC (ent_create npc_pilot_elite)
2. Try to execute them. Without this pr, you'll just punch them. With this pr, you'll properly execute them as expected.

Know issues:

• If firstperson executions are enabled, the game will create a duplicate pilot ragdoll after the animation's finished. See Firstperson execution issues #885
  https://github.com/user-attachments/assets/68375bb5-29ed-4f59-b5fb-a5eb0a0fcc44

[Alystrasz]

I suspect the PR has side effects.

Without PR

pr_main.webm

With PR

pr_with_main.webm

[NachosChipeados]

I haven't been able to recreate that in my end, so i'm not sure why it happens. Will investigate though

Titanfall.2.2024-10-06.18-12-31.mp4

[NachosChipeados]

Yeah, i've got nothing. This pr doesn't modify their models or animations in any way, and i can't even repoduce the bug locally so i genuinely have no idea what's going on there

[NachosChipeados]

Update: while testing a completely unrelated pr, i managed to recreate the pilot elite bug, so i can confirm that it is unrelated to this pr and seems to be a bug with the vanilla game itself. I didn't even have this pr enabled while doing this, as you can see by the lack of exectuon prompt and headshot fx

Titanfall.2.2024-10-18.12-19-04.mp4

[Alystrasz]

I could reproduce the issue on another computer, with a fresh Titanfall2 + Northstar install.
Do you have any idea where this bug can come from?

[NachosChipeados]

Check #development in the discord

[Alystrasz]

Turns out behavior bugs are not introduced by this PR (see R2NorthstarTools/FlightCore#1038 for more details).

I confirm this PR allows to execute npc_pilot_elite NPCs.

npc_pilot_elite-execution.webm

[GeckoEidechse]

Merging based on reviews. Sorry it took so long ^^"