Basically, some external code can choos a unique id and create a message table for itself. The idea is that modders can hook into this as well so they can get their own message table and don't have to worry about conflicting with the base game's textIDs. I have also implemented this setup for Randomizer so that the pre-filled bottles (which didn't exist in the original outside of Ruto's letter) have unique text as compared to the text for the item they are filled with.
Pulls the Custom Message related code out into it's own class, which has an initialization phase where other enhancements / future features can create messages during an initialization phase to be stored and retrieved later. Along with this refactoring, the 4 bottle messages from the previous rando-specific system are now created and stored during intialization and retrieved by their getItemId.
Now that it isn't rando specific, the goal is to move anything text changes that are hard-coded into z_message_PAL.c and refactor it so that future text additions/overrides can be done without modifying that file.
Christopher Leggett