Used the COMPOUND_STRING macro to unify item descriptions and item data (#3432)

* Used the COMPOUND_STRING macro to unify item descriptions and item data

Misc. Changes:
-Corrected the Serious Mint's description.
-Moved the X_ITEM_STAGES and CONFUSE_BERRY_HEAL_FRACTION macros to the top of the file for consistency's sake.
-Corrected the Tapunium Z's description.

* Oops. I forgot to delete the old .description of the X Attack

* Removed definition of CONFUSE_BERRY_HEAL_FRACTION from include/constants/items.h

* Moved CONFUSE_BERRY_HEAL_FRACTION back to include/constants/items.h

* Unified item description strings where possible

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Co-authored-by: Bassoonian <iasperbassoonian@gmail.com>

src/item.c

@@ -23,7 +23,6 @@ static bool8 CheckPyramidBagHasSpace(u16 itemId, u16 count);
 
 EWRAM_DATA struct BagPocket gBagPockets[POCKETS_COUNT] = {0};
 
-#include "data/text/item_descriptions.h"
 #include "data/items.h"
 
 static u16 GetBagItemQuantity(u16 *quantity)