Revert "- removed STAT_INVENTORY."

This reverts commit 5ff0abe568.

- use STAT_INVENTORY only for held items.

Seems this was causing some strange issues with hubs, but for items placed in the world it still cannot be allowed to have them in a different statnum.

src/g_level.cpp

@@ -1280,7 +1280,7 @@ void G_FinishTravel ()
 
 		for (inv = pawn->Inventory; inv != NULL; inv = inv->Inventory)
 		{
-			inv->ChangeStatNum (STAT_DEFAULT);
+			inv->ChangeStatNum (STAT_INVENTORY);
 			inv->LinkToWorld ();
 			inv->Travelled ();
 		}

src/g_shared/a_pickups.cpp

@@ -821,6 +821,7 @@ void AInventory::BecomeItem ()
 	}
 	RemoveFromHash ();
 	flags &= ~MF_SPECIAL;
+	ChangeStatNum(STAT_INVENTORY);
 	SetState (FindState("Held"));
 }
 
@@ -847,6 +848,7 @@ void AInventory::BecomePickup ()
 	}
 	flags = (GetDefault()->flags | MF_DROPPED) & ~MF_COUNTITEM;
 	renderflags &= ~RF_INVISIBLE;
+	ChangeStatNum(STAT_DEFAULT);
 	SetState (SpawnState);
 }
 

src/statnums.h

@@ -53,7 +53,7 @@ enum
 	STAT_BOSSTARGET,						// A boss brain target
 	STAT_LIGHTNING,							// The lightning thinker
 	STAT_DECALTHINKER,						// An object that thinks for a decal
-	UNUSED_STAT_INVENTORY,							// An inventory item (value kept for savegame compatibility.)
+	STAT_INVENTORY,							// An inventory item
 	STAT_LIGHT,								// A sector light effect
 	STAT_LIGHTTRANSFER,						// A sector light transfer. These must be ticked after the light effects!!!
 	STAT_EARTHQUAKE,						// Earthquake actors