It's very easy to forget to add `require 'rails_helper'` at the top of every core/plugin spec file, and omissions can cause some very confusing/sporadic errors.
By setting this flag in `.rspec`, we can remove the need for `require 'rails_helper'` entirely.
This change both speeds up specs (less strings to allocate) and helps catch
cases where methods in Discourse are mutating inputs.
Overall we will be migrating everything to use #frozen_string_literal: true
it will take a while, but this is the first and safest move in this direction
* FEATURE: Added MaxMindDb to resolve IP information.
* FEATURE: Added browser detection based on user agent.
* FEATURE: Added recently used devices in user preferences.
* DEV: Added acceptance test for recently used devices.
* UX: Do not show 'Show more' button if there aren't more tokens.
* DEV: Fix unit tests.
* DEV: Make changes after code review.
* Add more detailed unit tests.
* Improve logging messages.
* Minor coding style fixes.
* DEV: Use DropdownSelectBoxComponent and run Prettier.
* DEV: Fix unit tests.
