Custom Corpse Animations for HL1

- Added a sitting corpse Barney animation and a custom Barney skin.
- Edited the barney.cpp file to enable monster_dead_barney entities to use the new animation.
- Finally I created a custom FGD for my mod in order to allow the monster_dead_barney entity to have a selectable setting for the "Sitting" animation.
This results in a new animation of Barney propped up against a wall, dead. This corpse can be gibbed and behaves as the standard HL corpses.

[@alexisdariofernandez2803]

Nice video. Your post about adding two skins to monster_barney and monster_barney_dead from TWHL.info brought me here!

[@SerMattzio]

Thanks mate :)

[@pezus553]

Really cool stuff bro!

[@veuch_]

heh, that's neat :D

[@SerMattzio]

Thanks dude.