* Fix issues with POSIX::Spawn, Terrapin and Ruby 3.0
Also improve the Terrapin monkey-patch for the stderr/stdout issue.
* Fix keyword argument handling throughout the codebase
* Monkey-patch Paperclip to fix keyword arguments handling in validators
* Change validation_extensions to please CodeClimate
* Bump microformats from 4.2.1 to 4.3.1
* Allow Ruby 3.0
* Add Ruby 3.0 test target to CircleCI
* Add test for admin dashboard warnings
* Fix admin dashboard warnings on Ruby 3.0
* Drop dependency on secure_headers, use always_write_cookie instead
* Fix cookies in Tor Hidden Services by moving configuration to application.rb
* Instead of setting always_write_cookie at boot, monkey-patch ActionDispatch
CSFR-prevention is already implemented but adding this doesn't hurt.
A brief introduction to Same-Site cookies (and the difference between strict and
lax) can be found at
https://blog.mozilla.org/security/2018/04/24/same-site-cookies-in-firefox-60/
TLDR: We use lax since we want the cookies to be sent when the user navigates
safely from an external site.
Nick Schonning
Eugen Rochko
Claire
Cecylia Bocovich
Moritz Heiber
Sorin Davidoi
Naoki Kosaka