Fixes + Polishing for character slot load menu

[Tenryumi]

About The Pull Request

Literally the exact same PR as Azure-Peak#5645 , just on here instead of Azure. So I will just copypaste everything here from there.

Multiple things:

• Fixed the character load list not showing characters slots that share the same name (This was caused by TGUI not supporting multiple items in a list having the same string name. This has been fixed by prepending the slot name with the slot #)
• Made the menu list characters by NICKNAME instead of REAL NAME (This way, if you have two different slots for a character with the same name, you can use nickname to differentiate them in the menu!)
• Made the list default to your current loaded slot
• Changed the title of said list (Because we're PEAK)

Developer's checklist

• Try to modularize as much as possible.
• Mark the start and end of edits outside the caustic modular folder (if applicable) for changes made.

• Ensure that it compiles locally, and test new features (when applicable, please record if not!), or potential issues with related features.

Testing Evidence

Made multiple character slots, three with the same real character name, one with a different nickname. Loaded multiple slots and saved with them. Slots are loaded and correctly even if characters share a real name and nickname!

Why It's Good For The Game

Sometimes you want character slots that have the same name! This fixes issues with that edge case and makes it a bit more convenient to look at and load all of those slots!

Changelog

🆑 Ryumi
fix: Fixed the character load list not showing all slots if any slots show the same name.
qol: The character load menu now lists character slots by NICKNAME instead of their REAL NAME. This way, if you have two different slots for a character with the same name, you can use nickname to differentiate them in the menu!
/:cl:

[faaaay]

Made the menu list characters by NICKNAME instead of REAL NAME (This way, if you have two different slots for a character with the same name, you can use nickname to differentiate them in the menu!)

Would it be possible to make this fall back on REAL NAME if there's no NICKNAME? Currently, any slot that doesn't already have a nickname set is listed as [EMPTY SLOT].

[Tenryumi]

Made the menu list characters by NICKNAME instead of REAL NAME (This way, if you have two different slots for a character with the same name, you can use nickname to differentiate them in the menu!)

Would it be possible to make this fall back on REAL NAME if there's no NICKNAME? Currently, any slot that doesn't already have a nickname set is listed as [EMPTY SLOT].

oh! yeah sure, that's fair!