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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

- additional information is now available in show response, use this to pull gguf before running
- make gguf updates cancellable

- remove ggml runner
- automatically pull gguf models when ggml detected
- tell users to update to gguf in the case automatic pull fails
Co-Authored-By: Jeffrey Morgan <jmorganca@gmail.com>

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Co-authored-by: Matt Apperson <mattapperson@Matts-MacBook-Pro.local>

- update chat docs
- add messages chat endpoint
- remove deprecated context and template generate parameters from docs
- context and template are still supported for the time being and will continue to work as expected
- add partial response to chat history

Co-authored-by: Wen Sun <iwendellsun@gmail.com>