* feat: add gpt4 support
* Update prompt_template_sample.json
* fix: cleaned up formatting for quotes
* feature: added context functionality (--use_context) for GPT4 model, which accumulates a running paragraph giving historical context to the current passage
* fix: propagated context_flag argument to txt_loader and srt_loader
* Updated Readme to include GPT4 parameters
* Removed debug output
* fix: lint
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Co-authored-by: yihong <zouzou0208@gmail.com>