Allow sub-folders in Outfits

[canny]

Test plan

Setup:

1. Right-click the My Outfits folder and choose New Folder from the context menu.
2. Verify a New Folder is created within the My Outfits folder. Rename the folder to Folder1
3. Right-click Folder1 and create a New Folder within it. Rename the folder to Folder2
4. Right-click Folder2 and choose New Outfit from the context menu.
5. Verify a New Outfit folder is created and it has a clothes hangar icon. Rename the folder to Outfit1

RULE: Outfits aren't permitted to be nested inside other outfits

1. Verify the Outfit1 folder cannot be moved into any other Outfit folder (folder with a clothes hangar icon).

RULE: Movement of Outfits is permitted to any subfolder or into My Outfits

1. Verify the Outfit1 folder can be moved between the "My Outfits" folder, Folder1, and Folder2
2. Verify the Outfit1 folder cannot be moved to any folder outside of the My Outfits folder. Eg. It cannot be moved to the root folder, Received items, the Animations folder, the Body Parts folder, etc.

RULE: Subfolders (not Outfit Subfolders) aren't permitted to accept items/links - Ie. The 'My Outfits' Subfolders can only accept My Outfits Subfolders or Outfit folders.

1. Verify no items can be added to Folder1.
2. Verify no links can be added to Folder1.
3. Click the + button > New Folder.
4. Verify that New Folder cannot be dragged into the My Outfits folder.
5. Verify that New Folder cannot be dragged into the Folder1 which is within the My Outfits folder.

RULE: Movement of Subfolders is permitted only into My Outfits or other subfolders.

1. Verify Folder2 (the 'My Outfits' Subfolder) can be dragged between the My Outfits folder and Folder1
2. Verify Folder2 cannot be dragged to any folder outside of the 'My Outfits' folder. Eg. It cannot be moved to the root folder, Received items, the Animations folder, the Body Parts folder, etc.

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As a user I should be able to create a new folder in the My Outfits directory of my inventory so that I can organize my outfits.

[canny]

This issue has been linked to a Canny post: Allow sub-folders in Outfits 🎉

[akleshchev]

Please provide use cases and what is expected. It's one cases if each subfolder is supposed to be an independent outfit while 'root' is just a folder, it's another if there should be subfolders for storing other invenotory, like a colection of animations for an outfit.

[akleshchev]

https://github.com/secondlife/jira-archive-internal/issues/64617 - Various requests related to either nesting outfits inside folder, nesting folders inside outfits.

As I see it there are two tasks here.

1. Allow subfodlers in 'Outfits' folder, such folder is not an outfit, but can contain multiple outfits. Probably should stay invisible in Apperarance floater. Probably should not allow items?
2. Allow subfolders in individual outfits, but the question is how such subfolders should work (ex: what menu options should they have? should they be worn along with the main fodler?)