[ESF] Entity Sound Features

• now requires Entity Model Features
• added playingSound.<n> random property for variating sounds, textures, and models
• added playsound(id, cond, x, y, z, a) boolean animation function for EMF
• added playsound(id, cond, x) boolean animation function for EMF
• added playingsound(id) boolean animation function for EMF

fixed 2 crashes