Set _XRayColor (HDR orange, alpha 0 = off by default), pulse speed/strength on Player.mat and xrayFadeDuration on the Player prefab.
Add the HalfLambert, HalfLambert brightness and specular-damp sliders to the paint HUD panel, dial the camo values on Player.mat, and disable shadow casting on the Paintman renderer so the player's cast shadow no longer gives away its position.
New Player.mat using Custom/PlayerCamoLit, assigned to the Paintman renderer on the Player prefab so the camo shader is active on hunters and hiders.