auto-save.nvim rewrite: everything changed

[pocco81]

Heya! I decided to rewrite auto-save because I kind of disliked the previous state of the code-base.

Notes:

1. Backwards compatibility with previous auto-save confs won't be provided
2. This plugin is completely different from the original, so please update your settings!
3. Previous issues won't be attended because 2. If your issue still exists please open a new one.
4. I added previous feature requests as I saw fit.

Enjoy :partying_face: :tada:

[jdhao]

It is not necessary to change the repo name if you want a rewrite...

[pocco81]

@jdhao True, but didn't just change it because of the rewrite. I previous naming convention it followed was simply a whim of mine. The current one, however, follows what most other neovim plugins use.

So it's better now :)