* convert-hf-to-gguf-update: automate updating
* convert-hf-to-gguf-update: improve download
* share requests session for performance
* create directories only when needed, don't skip downloads when empty directory encountered
* be more graceful about errors
* Try cwd for ggml-metal if bundle lookup fails
When building with `-DBUILD_SHARED_LIBS=ON -DLLAMA_METAL=ON -DLLAMA_BUILD_SERVER=ON`,
`server` would fail to load `ggml-metal.metal` because `[bundle pathForResource:...]`
returns `nil`. In that case, fall back to `ggml-metal.metal` in the cwd instead of
passing `null` as a path.
Follows up on #1782
* Update ggml-metal.m
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Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
* makefile: correct deps for server
* server: tighten settings layout a little
* server: expose all currently configured generation params in UI
* server: expose remaining generation params, for the adventurous
* server: embetter mirostat fields
