* Fix all but one flake8 linting errors
* Remove unused imports
* Wrap strings that are too long
* Add basic autogpts/autogpt/.flake8
* Delete planning_agent.py
* Delete default_prompts.py
* Delete _test_json_parser.py
* Refactor the example function call in AgentProfileGeneratorConfiguration from a string to an object
* Rewrite/update docstrings here and there while I'm at it
* Minor change to the description of the `open_file` command
* Use `user-agent` from config in web_selenium.py
* Delete hardcoded ABILITIES from core/planning/templates.py
* Delete duplicate and superseded test from test_image_gen.py
* Fix parameter definitions in mock_commands.py
* Delete code analysis blocks from test_spinner.py, test_url_validation.py
* Removed `autogpt.llm.base` and `autogpt.llm.utils`
* `core` does things async, so `Agent.think()` and `Agent.execute()` are now also async
* Renamed `dump()` and `parse()` on `JSONSchema` to `to_dict()` and `from_dict()`
* Removed `MessageHistory`
* Also, some typo's and linting fixes here and there
