New EEex Feature: Tweak EEex_GetUserDataAuxiliary()

[4Luke4]

This pull request introduces a significant refactor and extension of the user data auxiliary (UDAux) marshalling system, as well as new infrastructure for handling persistent auxiliary data for game objects.

Key changes are grouped below:

UDAux Marshalling System Refactor and Extension

• Refactored the sprite auxiliary data marshalling system to use a new, modular table bundle approach, replacing the previous custom serialization logic with calls to general-purpose functions (EEex_Marshal_Private_*). This simplifies the code and centralizes marshalling logic.
• Added new marshal handlers for sprite auxiliary data, enabling export/import of timed effects, equipped effects, and item auxiliary data, including logic for handling pending item auxiliary data during sprite load.

Persistent Auxiliary Data Support

• Introduced EEex_UserDataAuxiliaryPersistent and extended EEex_GetUserDataAuxiliary to support marking auxiliary data as persistent, allowing certain user data to survive across game sessions. In particular:
  • CGameContainer, CItem (container-owned)
  • CGameEffect, CItem (sprite-owned)
  • CStore, CStoreFileItem

Requires: Bubb13/InfinityLoader#9.

Notes

@Bubb13
As far as CGameEffect userdata are concerned, this solution does not work for Local variables stored as attached effects on CRE files, i.e. op187 effects (the same most likely holds for 265 / 309). However, that's probably intended since those are kinda special...