Added new class AdBlockMatcher that holds the cache of
all subscriptions with rules.
This moves the matching logic from AdBlockSubscription into
separate class.
It also fixes issue that CSS exception rules weren't able to
affect rules from different subscription.
For all rules that can be matched with simple string-contains match,
use fast tree searching.
Only in EasyList, there is 6000 those rules.
It improves overall performance of AdBlock matching by 5 - 10 times,
at the cost of memory.
The tree needs about 1.5MB memory for 1000 rules, which is a great
tradeoff for such big performance improvement.
Even empty QRegExp can occupy a lot of space in memory, which can
grow into a big number with tens of thousands AdBlock rules.
QRegExp is now allocated with new, and only when really needed.
- checking Referer of network request to determine
if it is third party request or not
* matching is performed on second-level domains
(there is minor issue with it in Qt < 4.8)
- improved performance with not using regexps when not necessary
- added support for element hiding even with domain restrictions
- almost all types of rules are supported now
* exceptions are only some special cases when rule has
unssuported options (part of rule after $ character)
* those rules are ignored
- you can add subscriptions in AdBlock dialog or with
abp: scheme links
- however, AdBlock rules are not yet optimized for performance
so you shouldn't add too much subscriptions
performance optimizations will come in next commits
- support for element hiding is still yet to come too
closes#266
