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Replaces `POST /api/create` to use JSON instead of a Modelfile.

This is a breaking change.

Now that server.cpp is gone, we don't need to keep passing arguments
that were only ignored and only kept for compatibility.

This reverts commit 66ab4877.

this change broke utf-8 scanning of multi-byte runes

A few obvious levels were adjusted, but generally everything mapped to "info" level.