Update OpenAI configuration with ImageModel and related changes

Previously, there was no option to specify the model for image generation in the OpenAI configuration. This commit adds a new option called "ImageModel" where you can specify the desired model. The default value for this option is "dall-e-2".

In the `GPTBot` class, the OpenAI object is now initialized with the `ImageModel` option if it is provided in the configuration. This allows the bot to use the specified image generation model in addition to the chat model.

Furthermore, in the `OpenAI` class, the `image_api` attribute has been renamed to `image_model` to reflect its purpose more accurately. The default value has also been updated to "dall-e-2" to align with the new configuration option.

This commit ensures that the OpenAI configuration is up-to-date and allows users to specify the desired image generation model.

config.dist.ini

@@ -67,6 +67,10 @@ LogLevel = info
 #
 # Model = gpt-3.5-turbo
 
+# The Image Generation model you want to use.
+#
+# ImageModel = dall-e-2
+
 # Your OpenAI API key
 #
 # Find this in your OpenAI account:

src/gptbot/classes/bot.py

@@ -138,7 +138,8 @@ class GPTBot:
                 bot.allowed_users = json.loads(config["GPTBot"]["AllowedUsers"])
 
         bot.chat_api = bot.image_api = bot.classification_api = OpenAI(
-            config["OpenAI"]["APIKey"], config["OpenAI"].get("Model"), bot.logger
+            config["OpenAI"]["APIKey"], config["OpenAI"].get("Model"),
+            config["OpenAI"].get("ImageModel"), bot.logger
         )
         bot.max_tokens = config["OpenAI"].getint("MaxTokens", bot.max_tokens)
         bot.max_messages = config["OpenAI"].getint("MaxMessages", bot.max_messages)

src/gptbot/classes/openai.py

@@ -21,11 +21,11 @@ class OpenAI:
         return self.chat_model
 
     classification_api = chat_api
-    image_api: str = "dalle"
+    image_model: str = "dall-e-2"
 
     operator: str = "OpenAI ([https://openai.com](https://openai.com))"
 
-    def __init__(self, api_key, chat_model=None, logger=None):
+    def __init__(self, api_key, chat_model=None, image_model=None, logger=None):
         self.api_key = api_key
         self.chat_model = chat_model or self.chat_model
         self.logger = logger or Logger()
@@ -146,6 +146,7 @@ Only the event_types mentioned above are allowed, you must not respond in any ot
 
         image_partial = partial(
             openai.Image.acreate,
+                model=self.image_model,
                 prompt=prompt,
                 n=1,
                 api_key=self.api_key,