Fix monster_tentacle missing spawnflag 64 (different model option)

Resolves #65

dlls/tentacle.cpp

@@ -32,6 +32,8 @@
 #define ACT_T_STRIKE 1030
 #define ACT_T_REARIDLE 1040
 
+constexpr int SF_TENTACLE_USE_LOWER_MODEL = 1 << 6;
+
 class CTentacle : public CBaseMonster
 {
 public:
@@ -260,7 +262,15 @@ void CTentacle::Spawn()
 	//Always interpolate tentacles since they don't actually move.
 	m_EFlags |= EFLAG_SLERP;
 
-	SET_MODEL(ENT(pev), "models/tentacle2.mdl");
+	if (pev->spawnflags & SF_TENTACLE_USE_LOWER_MODEL)
+	{
+		SET_MODEL(ENT(pev), "models/tentacle3.mdl");
+	}
+	else
+	{
+		SET_MODEL(ENT(pev), "models/tentacle2.mdl");
+	}
+
 	UTIL_SetSize(pev, Vector(-32, -32, 0), Vector(32, 32, 64));
 
 	pev->takedamage = DAMAGE_AIM;
@@ -298,6 +308,7 @@ void CTentacle::Spawn()
 void CTentacle::Precache()
 {
 	PRECACHE_MODEL("models/tentacle2.mdl");
+	PRECACHE_MODEL("models/tentacle3.mdl");
 
 	PRECACHE_SOUND("ambience/flies.wav");
 	PRECACHE_SOUND("ambience/squirm2.wav");