WIP: use user interactions to whitelist hosts.

[cowlicks]

This implements something like what Cliqz does, as described by this this issue.

We create an ephemeral whitelist of domains from user interactions, then check this whitelist when we call isThirdParty

Todo:

• we should probably attach the whitelist to Tabs instead of each Tab.
• add tests
• actually find a domain where this fixes an issue, and test it
• make the whitelist a FIFO cache
• cache duplicate user interactions in the contentscript so we don't send too many messages
• add selenium tests

Related to #72 and #4

[jotake]

I am involved with some files than need some change also.
I I will get some important information from your work.
Have a nice day
Good work

[jeroenev]

any updates on this?

[cowlicks]

@jeroen7s hi! I just rebased this on to master. I think I had intended to merge this after I added selenium tests, and could add tests for this PR. Adding selenium tests was done in #103 and #125. If you'd like to help, I need to go through that todo checklist at the top of this PR, and add tests. Feel free to do that stuff, I happy to answer any questions or emails you have along the way.