Dynamic filtering's default-deny is unusable

[gorhill]

Globally blocking the all cell causes everything to be blocked, including css, rendering the default-deny mode unusable in practice.

The all row, added in #682, has not been officially released yet, so it's a good time to fix this.

Solution: split the all row into two rows: 1st-party, 3rd-party.

[Snapy]

I would really appreciate it. Indeed I was thinking on opening an issue asking to extend the syntax of dynamic filtering rules to add 1st-party as it is in µMatrix but wasn't sure if it was appropriate for µBlock. So if you do could you also add other useful rules syntax I might have missed (if you don't mind).

[gorhill]

Just added a 3rd-party row and kept all row. a 1sp-party row would be unlikely be useful for users of default-deny mode. On the other hand a all row is useful to users of equivalent of "blacklist" mode. An all row may also sometimes be useful to any user who wish for example to "whitelist" a page while keeping ability to block specifically some stuff.

[gorhill]

For translators:

3rd-party refers to any type of resource which is 3rd-party to the site.