Fix compatibility with Python 3.13 and Windows, enable --json flag su…

[OlaszPL]

…pport and preserve bullet points in text

[patrickxia]

This breaks it for (at least) Linux.

RuntimeError: A SemLock created in a fork context is being shared with a process in a spawn context. This is not supported. Please use the same context to create multiprocessing objects and Process.

[AngledLuffa]

The biggest limitation to using spawn - which I have not seen anyone address before, including this PR - is that everything needs to be passed to the spawns. With fork the children processes simply get a memory reference to the existing templates etc. With spawn those are initilized to empty.

https://docs.python.org/3/library/multiprocessing.html#contexts-and-start-methods

Simply passing the entire templates hash would not work, either, as for large dumps that would be extremely slow and use a ton of memory. I am working on this, but not quite finished.

The other changes, such as to_json, regex updates, etc, have been merged in with other changes.

Thank you for the contribution, though. If you find more errors (starting from master), we'll be here.