default to O2 on release builds as O3 can cause larger code to be even larger; fix most of the compiler warnings

engine/server/library/serverGame/src/shared/console/ConsoleCommandParserSpawner.cpp

@@ -12,7 +12,7 @@
 #include "serverGame/CreatureObject.h"
 
 #include <cstdio>
-#include <hash_set>
+#include <unordered_set>
 
 // ======================================================================
 

engine/server/library/serverGame/src/shared/region/RegionMaster.cpp

@@ -706,7 +706,7 @@ const Region * RegionMaster::addDynamicRegion(const UniverseObject & source)
 			DEBUG_WARNING(true, ("RegionMaster::addDynamicRegion object %s has unknown "
 				"geometry type", source.getNetworkId().getValueString().c_str(),
 				geometry));
-			return false;
+			return NULL;
 	}
 	if (region == NULL)
 	{

engine/server/library/serverGame/src/shared/space/ShipInternalDamageOverTimeManager.cpp

@@ -235,13 +235,13 @@ ShipInternalDamageOverTime const * const ShipInternalDamageOverTimeManager::find
 
 	//-- there is no lower bound, the idot is not in the vector
 	if (lowerBound == s_idotVector.end())
-		return false;
+		return NULL;
 
 	ShipInternalDamageOverTime & lowerBoundIdot = *lowerBound;
 
 	//-- the lower bound sorts greater than the new idot, therefore this is a new insertion
 	if (idot < lowerBoundIdot)
-		return false;
+		return NULL;
 
 	return &lowerBoundIdot;
 }

engine/shared/library/sharedGame/src/shared/core/GameScheduler.cpp

@@ -74,7 +74,7 @@ void GameScheduler::remove()
 	DEBUG_FATAL(!s_installed, ("GameScheduler not installed."));
 
 	delete s_scheduler;
-	s_scheduler = false;
+	s_scheduler = NULL;
 
 	s_installed = false;
 }