Dendron

Added support for emitting log probabilities from a `CompletionCondition` node.

Added support for ViP-LLaVa. In so doing, created a mechanism to easily add support for new vision-language models in the `ImageLMAction` node.

Updated language model nodes to properly use BitsAndBytes configuration. This should remove deprecation warnings.

Updating README.

Initial release of the Dendron library for structured programming with language models and behavior trees. This release includes

* behavior tree functionality implemented in Python,
* language model support provided by Hugging Face Transformers,
* and a tutorial introduction to the library in which the programmer creates an agent that can speak with TTS, listen with ASR, and think using a chat LLM.