Bots throw grenades from cover

[sunzenshen]

Description

Bots decide whether they can throw a grenade at a threat after retreating to cover.

Toolchain

• Windows MSVC VS2022

[sunzenshen]

Demo with sv_neo_grenade_debug_behavior enabled:

• https://streamable.com/la2yok
• https://streamable.com/e3o1y1
• https://streamable.com/2t4ofz

[sunzenshen]

Added some tweaks on top of the code review feedback, where the tweaks can be seen by themselves with:

• a2c5ce3

[sunzenshen]

Pardon the large set of changes after the initial review. After watching the bots throw grenades in the context of playing rounds of CTG, I decided to chase down some edge cases with throw reliability and frag safety.

[sunzenshen]

Really sorry for the additional code churn and I should have done this earlier, but I was previously hoping that the grenade retreat logic from tactical monitor would fire soon enough after a grenade was thrown, but after seeing another bot run after their grenade and die, don't think it's triggering fast enough. (To recap, the tactical monitor check is throttled to emulate a human reaction time, but I think we need to immediately trigger a search for throwers since they are both immediately near their own grenade and they are often running in the same direction of their throw.)

So I refactored out the grenade search from tactical monitor and placed it directly in the grenade retreat behavior. I also adapted the grenade retreat behavior to allow triggering without a specific grenade threat, so that we can trigger a grenade retreat immediately after a throw.