Ability to block and unblock users, hide or flag comments from blocked users, show a blocked chip in profile

[folkemat]

Hi, this PR copies most of the dead/inactive pull request 940 with some changes.

• "Hide comment chains from blocked users" is enabled by default
• If disabled, "[blocked]" is added to the author and the comment collapses
• A "Blocked" chip is displayed in the profile of blocked users
• Users can be blocked via a "Block" button in the profile
• Users can be unblocked via a "Unblock" button in the profile

[QuantumBadger]

Thanks for this, it mostly looks good! Some comments:

• The "Block" option is shown on the user profile even if the user is logged out.
• It would be good to improve the error message shown to users when they need to re-login. Specifically, we should:
  • Detect when Reddit sends a 403 permission error when blocking
  • If it's a 403, show a dialog saying the user must re-login, with a "re-login" button taking them to the OAuthLoginActivity. It shouldn't be necessary to log out -- simply going through the login process should get a new token.
  • If it's not a 403, show a standard error dialog that doesn't mention logging in again.
• When the block operation is in progress, the "Blocking..." chip should be greyed out

If you have any questions please let me know!

[QuantumBadger]

Also I've fixed the CI failure in master (it was caused by a runner upgrade), so rebasing should fix the build failure.

[folkemat]

I have implemented all your good ideas:

• Block button is now no longer displayed when anonymous.
• I had a hard time with the re-login thing and figuring out how OAuthLoginActivity works, but I think it should all work now: In case of error 403, a custom permission error dialog appears with a re-login option that performs a new login that sets a new token
• Standard error dialogue if it is not error 403.
• (Un)Blocking... is greyed out.
• Reworked the strings.

Android Lint and Unit tests are failing for some plugin error, I don't think this has something to do with my changes?

[QuantumBadger]

Thanks for making the changes @folkemat! I'll get this merged in soon. Not sure what's causing the CI failures, I'll investigate.

[QuantumBadger]

@folkemat Thanks again, I've merged this in, sorry about the long delay! Changelog also updated.