Avoid crash in ~LightsDriver_SystemMessage (#1663)

* Avoid crash in ~LightsDriver_SystemMessage

This will avoid a crash caused by the fact LIGHTSMAN is destroyed
after the other MAN objects

* Rework code path for turning lights off on exit

Calls to LightsDriver::reset removed from each driver to avoid any crashes

LightsDriver::reset renamed to Rest to match surrounding style

Added LightsManager::TurnOffAllLights, called before XXXMAN objects are deleted

src/LightsManager.cpp

@@ -512,6 +512,12 @@ bool LightsManager::IsEnabled() const
 	return m_vpDrivers.size() >= 1 || PREFSMAN->m_bDebugLights;
 }
 
+void LightsManager::TurnOffAllLights()
+{
+	FOREACH( LightsDriver*, m_vpDrivers, iter )
+		(*iter)->Reset();
+}
+
 /*
  * (c) 2003-2004 Chris Danford
  * All rights reserved.