v0.76 - premium mode auto-switching

Author: FlyingFathead

README.md

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 # Changelog
+- v0.76 – **Premium mode auto-switching** + usage DB synergy
+  - Added daily usage-based auto-switch logic between “premium” vs. “mini” models (see `[ModelAutoSwitch]` in `config.ini`).
+  - Once you exceed the `PremiumTokenLimit`, the bot seamlessly switches to the fallback model.
+  - If that fallback also goes past `MiniTokenLimit`, the bot can either deny usage or proceed, according to `FallbackLimitAction`.
+  - New param `model_info` for logging function calls, so the “Bot” lines in your chat log can show which model/tier is used (i.e. `model=gpt-4, tier=premium, usage=12345/500000`).
+  - Some small bugfixes for the SQLite usage DB, ensuring we properly update `premium_tokens` or `mini_tokens` after each request based on the `usage` field in OpenAI’s response.
 - 0.75056 - switched to newer Perplexity API models due to new models / old model depreciation
   - see [Perplexity API guide for supported models](https://docs.perplexity.ai/guides/model-cards)
 - v0.75055 - fixes to the html sanitizer (for Telegram's API; better handling of malformed html), using BeautifulSoup4+lxml for parsing now