Stop leaking function damage expressions.

- Function damage expressions parsed from DECORATE are now stored in a
  single array and deleted at the end of FinishThingdef().

src/thingdef/thingdef.cpp

@@ -66,6 +66,8 @@
 #include "vmbuilder.h"
 #include "stats.h"
 
+TDeletingArray<class FxExpression *> ActorDamageFuncs;
+
 // EXTERNAL FUNCTION PROTOTYPES --------------------------------------------
 void InitThingdef();
 void ParseDecorate (FScanner &sc);
@@ -351,8 +353,8 @@ static void FinishThingdef()
 
 		if (def->Damage != NULL)
 		{
+			FxDamageValue *dmg = (FxDamageValue *)ActorDamageFuncs[(uintptr_t)def->Damage - 1];
 			VMScriptFunction *sfunc;
-			FxDamageValue *dmg = (FxDamageValue *)def->Damage;
 			sfunc = dmg->GetFunction();
 			if (sfunc == NULL)
 			{
@@ -389,6 +391,9 @@ static void FinishThingdef()
 		I_Error("%d errors during actor postprocessing", errorcount);
 	}
 
+	ActorDamageFuncs.DeleteAndClear();
+	StateTempCalls.DeleteAndClear();
+
 	// Since these are defined in DECORATE now the table has to be initialized here.
 	for(int i = 0; i < 31; i++)
 	{
@@ -415,6 +420,7 @@ void LoadActors ()
 
 	timer.Reset(); timer.Clock();
 	StateParams.Clear();
+	ActorDamageFuncs.Clear();
 	GlobalSymbols.ReleaseSymbols();
 	FScriptPosition::ResetErrorCounter();
 	InitThingdef();

src/thingdef/thingdef.h

@@ -154,6 +154,7 @@ public:
 
 extern FStateExpressions StateParams;
 
+extern TDeletingArray<class FxExpression *> ActorDamageFuncs;
 
 //==========================================================================
 //

src/thingdef/thingdef_properties.cpp

@@ -544,7 +544,14 @@ DEFINE_PROPERTY(damage, X, Actor)
 
 	// Store this expression here for now. It will be converted to a function
 	// later once all actors have been processed.
-	defaults->Damage = (VMFunction *)id;
+	if (id == NULL)
+	{
+		defaults->Damage = NULL;
+	}
+	else
+	{
+		defaults->Damage = (VMFunction *)(uintptr_t)(ActorDamageFuncs.Push(id) + 1);
+	}
 }
 
 //==========================================================================