Moved invite URL generation to global function within utils/generate_invite_url.py.
Deleted utils/__main__.py and utils/base_utility_function.py.
Removed main() from utils/init.py.
Moved call to generate_invite_url() to startup.py.
    - If main guild not set, invite URL will be outputted and bot will be shutdown.
    - If main guild is set, invite URL will only be outputted if CONSOLE_LOG_LEVEL in environment variable set to DEBUG.
I had to modify tests for generate_invite_url() in test/tests_util.py reflect new behavior as it no longer takes in command line arguments.
    - You may need to modify it accordingly to remove irrelevant test cases and adjust to new behavior.

- Modify autocomplete to only display channels
- Modify archive to change permission for one channel
- Modify archive to add archive- before channel.name to mark it as archived

…129/TeX-Bot-Py-V2 into archive-single-channel