Feature request: Add To/From Base32768

**Is your feature request related to a problem? Please describe.**
no

**Describe the solution you'd like**
I'd like to have support for Base32768, a (not very common tbh) encoding that can be used in UTF-16 systems.
That would be in the form of "To Base32768" and "From Base32768" steps, along with auto-recognition in "Magic".

**Describe alternatives you've considered**
Unrelated: As there are many versions of BaseNNN, I would squash them all into one configurable step, for example "To/From BaseNNN" and inside of it you choose the number as a parameter

**Additional context**
[Example implementation](https://github.com/qntm/base32768)

Start by reviewing the linked base32768 example implementation and CyberChef's existing encoding operations, then trace the Magic recognition entry point mentioned in the request. Done means adding To Base32768 and From Base32768 steps and supporting automatic recognition in Magic, with behavior covered by the project's relevant operation tests.

Written by the indexing model from the issue text.