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/include/functions.h

@@ -2452,11 +2452,13 @@ void Font_LoadOrderedFontNTSC(Font* font);
 // #endregion
 
 // #region SOH [General]
-
 void Interface_RandoRestoreSwordless(void);
 s32 Ship_CalcShouldDrawAndUpdate(PlayState* play, Actor* actor, Vec3f* projectedPos, f32 projectedW, bool* shouldDraw,
                                  bool* shouldUpdate);
 
+// #region SOH [Rocs Feather]
+void func_80838940(Player* this, LinkAnimationHeader* anim, f32 arg2, PlayState* play, u16 sfxId);
+
 // #endregion
 
 #ifdef __cplusplus