GitLab

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

This is a breaking change.

stop parameter is saved as a slice which is incompatible with modelfile
parsing

This reverts commit 9ac0a7a5.

This enhances our regex to support windows style paths.  The regex will
match invalid path specifications, but we'll still validate file
existence and filter out mismatches