Implement bag_sort branch

include/config/item.h

@@ -20,6 +20,8 @@
 #define I_POWER_ITEM_BOOST              GEN_LATEST  // In Gen7+, Power Items grant 8 EVs instead of 4 EVs.
 #define I_PREMIER_BALL_BONUS            GEN_LATEST  // In LGPE onwards (Gen8+ here), you are given a Premier Ball for every 10 Poké Balls of any type and in the same purchase. Previously, it only applied to regular Poké Balls and only 1 could be obtained per purchase.
 
+#define I_BAG_SORT              TRUE        // Enables sorting the bag by pressing the Start button
+
 // TM config
 #define I_REUSABLE_TMS          FALSE       // In Gen5-8, TMs are reusable. Setting this to TRUE will make all vanilla TMs reusable, though they can also be cherry-picked by setting their importance to 1.
 

include/item.h

@@ -36,6 +36,7 @@ struct BagPocket
 extern const struct Item gItemsInfo[];
 extern struct BagPocket gBagPockets[];
 
+u16 GetBagItemQuantity(u16 *quantity);
 void ApplyNewEncryptionKeyToBagItems(u32 newKey);
 void ApplyNewEncryptionKeyToBagItems_(u32 newKey);
 void SetBagItemsPointers(void);

src/item.c

@@ -30,7 +30,7 @@ EWRAM_DATA struct BagPocket gBagPockets[POCKETS_COUNT] = {0};
 #include "data/pokemon/item_effects.h"
 #include "data/items.h"
 
-static u16 GetBagItemQuantity(u16 *quantity)
+u16 GetBagItemQuantity(u16 *quantity)
 {
     return gSaveBlock2Ptr->encryptionKey ^ *quantity;
 }