Add support for subscribing to a filter by clicking a special link on a webpage #1945
Let's implement filter subscription's auto-detection, similar as in case of userscripts. So if we click on subscribe button for any filters (e.g. on the https://adblockplus.org/subscriptions), Adguard invoke "Import filter" dialog with specified filter's link. Also, we need in "Automatically detect filter subscriptions" check-box in the Ad Blocker section.
We should intercept clicks on the page and check the
Also, we should check the "subscriptionUrl" field in filters meta: http://filters.adtidy.org/windows/filters.json
If subscription url matches any of known filters, we'd better enable it.
One more thing to change. I don't like the way it works now when we for some reason cannot validate a filter list.