refactor: use dynamic rules for dnr and improvements

[ACTCD]

Use dynamic ruleset instead of session ruleset to resolve #683.

Simply refactor the DNR adding process to improve fault tolerance and error handling.

[quoid]

I can quite remember why I originally used session rules over dynamic rules. There was a reason, but it eludes me. Maybe after this is merged I will remember, but for the time being looks good to me.

[ACTCD]

I can quite remember why I originally used session rules over dynamic rules. There was a reason, but it eludes me. Maybe after this is merged I will remember, but for the time being looks good to me.

Nothing obvious negatives comes to mind. Except that we do have to be careful about how long it lasts.
I noticed that even if I deleted the app, the previous ruleset was still there after the next installation.
Of course, these rules will not take effect after the App is deleted, but they are not deleted at the same time.