Add season spirit to current puppet classes

- Add skins to most of puppet classes (except SCP-173 (because they already have randomization and Christmas face), SCP-178-1, SCP-650 (they have only Christmas skin) and SCP-938)

New features

- SCP-266 VFX overhaul.

- Agents now have a visual flashlight on their vest.

- Began AI rework - add SCP-939 (and Scientists since 5.6.0) style of wandering to MovableNpc *Yni Viar's comment: originally, it was 6.0 feature, but I decided to do it for 5.6*

- Researchers no longer spawn in Entrance subzone

- Added slight-visible doors for Research Zone (Maintenance Zone have doors since 5.5.0)

Bugfixes

- Fix CI event crash - also change CI logic.