Add a modificator to exclude certain entries from the filtering log

**Case:**
I don't want to see in the Filtering Logs entries that contain certain domains (e.g. icloud.com, apple.com etc) because they "pollute" the log and make searching for domains that matter harder.

**Proposed solution:**
Create a modificator `$nolog` or similar, so that once a rule `apple.com$nolog` is added to the User filter, corresponding entries are not shown in the log.