Command groups, allow all users to use bot commands by omitting params in .env, more fine-tuned permissions, optional GPT-3 generated welcome message for new joins

What's Changed

Allow for all users to use ADMIN, GPT, and DALLE group commands by just omitting the relevant line in the .env file

• Karl Kennerley GPT3 Discord Issue#34 by @KarlKennerley in https://github.com/Kav-K/GPT3Discord/pull/43
• Slashgroups refactor and separation of commands based on roles by @Hikari-Haru in https://github.com/Kav-K/GPT3Discord/pull/48

New Contributors

• @KarlKennerley made their first contribution in https://github.com/Kav-K/GPT3Discord/pull/43

Full Changelog: Kav-K/GPT3Discord@v2.1.3...v2.2