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This focuses on Windows first, but coudl be used for Mac
and possibly linux in the future.

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