[NPCs] Actbusy support for Houndeyes

[Yankumo-Koishi]

Is your feature request related to a problem? Please describe.

Currently I'm making a custom map with Houndeyes, I wanna recreate their behavior like sleeping, inspecting environment objects from HL1

Describe the solution you'd like

The solution comes into my mind is Actbusy system, Valve heavily used them during the development o Episodic for slump zombies. But I noticed that Houndeyes doesn't support to use this system

Describe alternatives you've considered

Houndeyes should be able to use Actbusy System

Additional context

Nope