ollamar 1.2.0

• All functions calling API endpoints have endpoint parameter.
• All functions calling API endpoints have ... parameter to pass additional model options to the API.
• All functions calling API endpoints have host parameter to specify the host URL. Default is NULL, which uses the default Ollama URL.
• Add req as an output format for generate() and chat().
• Add new functions for calling APIs: create(), show(), copy(), delete(), push(), embed() (supercedes embeddings()), ps().
• Add helper functions to manipulate chat/conversation history for chat() function (or other APIs like OpenAI): create_message(), append_message(), prepend_message(), delete_message(), insert_message().
• Add ohelp() function to chat with models in real-time.
• Add helper functions: model_avail(), image_encode_base64(), check_option_valid(), check_options(), search_options(), validate_options()