feature: Subfolders and folder management system

[LichoU1]

Description

Folders are really convenient during creation in the program, but there is no folder management system [name change]. Additionally, it is not possible to create subfolders. This would be most useful in the "quest" tab, but in other tabs like "item," etc., I see great potential and facilitation during creation. When adding tasks in the game's "quest control," it doesn't recognize folders, making it tedious to find the right task.

Intended Use-Case

Request for addition:
Subfolders - working with the program would be more enjoyable, thus speeding up the creation process.
Visibility of folders and subfolders - quicker navigation and finding tasks.

Duplicate Check

• This feature request is not a duplicate to the best of my knowledge.