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This allows there to be a file that is a list of models that is
not mixed into the runner code.

Refactor mllama image processing code, and add pixtral and qwen2vl

Co-authored-by: jmorganca <jmorganca@gmail.com>
Co-authored-by: Michael Yang <mxyng@pm.me>
Co-authored-by: Jesse Gross <jesse@ollama.com>