Edit predictions improvements

[DiamondDNB]

I have been using the edit prediction functionality for a while and I really like it, and it has done a very good job in making coding faster. There are some improvements I would like to see:

1. Make it much easier to delineate between Zeta's suggestions when using unsupported custom themes, or just in general.
2. Make it easier to reject suggestions, maybe by using a shortcut.
3. More control over what exactly Zeta can predict, possibly by using the assistant panel to tell Zeta what and what not to predict for.
4. Cleaning up and simplifying edit prediction controls in the settings file.

Overall, Zeta is an incredibly useful tool, but with all things new, it needs some time to improve