Allow to prioritize RegEx over domainlist

Adding to what I wrote (I just re-read some posts here):

  1. Arbitrarily changing priority would be complicated to implement. Allowing to specify that black regex should be lookup up before the adlists which be fairly simple, however, I'm not sure how easy it would be to explain what this config option is doing. When a feature isn't easily explainable, it seems wrong to have it (as there should be a better alternative).
  2. We cannot add extensions like ;reply=... to the exact lists as this would completely destroy the extremely favorable fast lookup times.
  3. If you whitelist, you can do everything what you want with this domain in a dnsmasq config file right now, so this comment is directly applicable to whitelisted domains even without any code changes and with all versions of FTL.