Improve @@ rules to not disable cosmetics

[ameshkov]

Exception rules in Safari rely on the rule type ignore-previous-rules so to make it work we have to order the rules in a specific order. Exception rules without modifiers are placed at the end of the list and therefore they disable not just URL blocking, but cosmetic rules as well.

We could solve this by limiting resource-type list for those rules.

However, this will increase the list size and complexity so before doing that we should weigh pros and cons. How much bigger the final list will be?