[IMP] Support nested note_directories in case templates

[Che4ter]

Case template note directories can now contain nested note_directories to create sub-directory trees of arbitrary depth.
A directory can hold notes, sub-directories, both, or neither - only title is required.

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[Che4ter]

Hello @whikernel
Is there anything I can do, so you can merge this pull request?
I think its a useful feature, it works fine for us.