Add Roc's Feather (custom item) to Rando Item Pool (#6035)

This adds Roc's as a fully implemented item into the randomizer pool. When both Roc's and Nayru's is found, you can swap between them on the pause menu

Many people have contributed to this over time, so huge shoutout to:
- kentonm, this item is directly inspired by their Roc's Feather from their romhack Indigo. Also provided me with their GI model, icon texture and animation to use.
- PurpleHato, for providing the images for the item name shown on the kaleidoscope.
- Dana The Elf, providing another custom animation for the item.
- Reppan, for helping to tweak the animation and exporting the GI model for me.

soh/src/code/z_inventory.c

@@ -3,6 +3,7 @@
 #include "textures/icon_item_static/icon_item_static.h"
 #include "textures/icon_item_24_static/icon_item_24_static.h"
 #include "textures/parameter_static/parameter_static.h"
+#include <soh_assets.h>
 
 // Bit Flag array in which gBitFlags[n] is literally (1 << n)
 u32 gBitFlags[] = {
@@ -168,6 +169,35 @@ void* gItemIcons[] = {
     gOcarinaBtnIconCLeftTex,
     gOcarinaBtnIconCRightTex,
     gOcarinaBtnIconATex,
+    // Push down array to reach newly added item IDs
+    "",
+    "",
+    "",
+    "",
+    "",
+    "",
+    "",
+    "",
+    "",
+    "",
+    "",
+    "",
+    "",
+    "",
+    "",
+    "",
+    "",
+    "",
+    "",
+    "",
+    "",
+    "",
+    "",
+    "",
+    "",
+    "",
+    // Start custom items
+    gRocsFeatherTex,
 };
 
 // Used to map item IDs to inventory slots

soh/src/code/z_parameter.c

@@ -2463,6 +2463,12 @@ u8 Item_Give(PlayState* play, u8 item) {
             }
         }
 
+        return Return_Item(item, MOD_NONE, ITEM_NONE);
+    } else if (item == ITEM_NAYRUS_LOVE && Randomizer_GetSettingValue(RSK_ROCS_FEATHER)) {
+        Flags_SetRandomizerInf(RAND_INF_OBTAINED_NAYRUS_LOVE);
+        if (INV_CONTENT(ITEM_NAYRUS_LOVE) == ITEM_NONE) {
+            INV_CONTENT(ITEM_NAYRUS_LOVE) = ITEM_NAYRUS_LOVE;
+        }
         return Return_Item(item, MOD_NONE, ITEM_NONE);
     }
     returnItem = gSaveContext.inventory.items[slot];

soh/src/code/z_play.c

@@ -594,6 +594,10 @@ void Play_Init(GameState* thisx) {
         gSlotAgeReqs[SLOT_TRADE_CHILD] = AGE_REQ_CHILD;
     }
 
+    // Handle Rocs Feather requiement
+    gItemAgeReqs[ITEM_ROCS_FEATHER] = AGE_REQ_NONE;
+    gSlotAgeReqs[SLOT_NAYRUS_LOVE] = AGE_REQ_NONE;
+
     func_800304DC(play, &play->actorCtx, play->linkActorEntry);
 
     while (!func_800973FC(play, &play->roomCtx)) {