PNG Stalkers v21 Small Full Body Door Jester

Changes:
- Door Jester uses a full-body texture with no missing torso/body chunks.
- Smaller than v20.
- Uses vertical billboard to reduce look-up/look-down zoom problems.
- Door opening remains the force-open version.
- Touch him = attacker spawns.
- Ignore 15 seconds = he leaves, no attacker.
