GitLab

- Make function variables local
- Use prompt color sequences
- Use guard clause to check for curl
- Improved syntax

Fixes #6949

Gaaah.

This plugin was designed so that if there is any failure, it will simply call itself recursively. Which means that if you were working offline, if `quote` was called in your `.zshrc`, you would be unable to open a new terminal session.

I fixed this by allowing the plugin to output nothing if a quote could not be fetched.

correcting an issue about encoding some people was having
added a message when the user doesn't have curl
added varibles for colors->easier to customize