Code refactoring and performance boosts

Howdy! I've refactored most of your code (in a day! turns out it's exhausting xD), and here are most of the things I did: 1. Switched to the 2024 rust edition 2. Removed useless impl's and slow code from Tag 3. Optimized add_ref and clear_for_drop majorly 4. Made a lot of style changes Once I have some time, I ask you to review this code and, for consistency, try to change what I missed to the new code style (as long as you like it). Feel free to propose any changes! Thanks, Alex <3