* PoC: add chat template heuristics
The fallback chat template adapter of Vicuna is not ideal in some cases (e.g. a test against a sub-portion of the BBC news classification task on Kaggle gave an 82% accuracy with Vicuna and 88% with the official ChatML format for a q4_k_m Qwen 2.5 3B-Instruct gguf).
This PR adds a proof of concept simple heuristic which looks at the chat template and upgrades the adapter when it is able to.
* gemma 2 heuristic
* Phi 4, Llama 3.x heuristics
* better qwen vs generic heuristic
* cleanup
* mistral (generic) heuristic
* fix sys msg for mistral
* phi 3.5
* mistral v3
* cohere (aya expanse 32b based)
* only derive from chat template if AutoGuess
* add notes about alpaca fallbacks
* added AutoGuess.json dummy
* add mistral v7
* switch to using a json list with search strings
