- Fix a few possible crashes.

- Fix xenmaker sprites never being removed if their framerate is 0.
- Fix xenmaker sprites never showing if their scale is 0.
- Add trigger_setcvar.
- New "health" keyvalue for monsters/monstermaker for custom health.

src/dlls/stukabat.cpp

@@ -106,7 +106,7 @@ void CMStukabat :: Spawn()
 	pev->movetype		= MOVETYPE_FLY;
 	pev->flags			|= FL_FLY;
 	m_bloodColor		= !m_bloodColor ? BLOOD_COLOR_YELLOW : m_bloodColor;
-	pev->health			= gSkillData.stukabatHealth;
+	if (!pev->health)	{ pev->health = gSkillData.stukabatHealth; }
 	pev->view_ofs		= Vector ( 0, 0, 22 );// position of the eyes relative to monster's origin.
 	m_flFieldOfView		= 0.5;// indicates the width of this monster's forward view cone ( as a dotproduct result )
 	m_MonsterState		= MONSTERSTATE_NONE;