Add a config setting to allow creative mode players to override inventory setting.

src/main/java/com/sk89q/worldedit/WorldEdit.java

@@ -345,7 +345,8 @@ public class WorldEdit {
             // Have the session use inventory if it's enabled and the player
             // doesn't have an override
             session.setUseInventory(config.useInventory
-                    && !(config.useInventoryOverride
+                    && !((config.useInventoryOverride ||
+                            (config.useInventoryCreativeOverride && player.hasCreativeMode()))
                             && player.hasPermission("worldedit.inventory.unrestricted")));
 
         }