Upstream changes
- properly check for baseline required PHP version (7.4)
- af_redditimgur: absolutize links before working on them (again)
- Revert "af_redditimgur: absolutize links before working on them"
- af_redditimgur: absolutize links before working on them
- af_redditimgur: don't try to check if null domain is blacklisted
- add HOOK_LOGINFORM_ADDITIONAL_BUTTONS * allow plugins to inject JS code into login form
- public: allow system plugins to expose public methods
- make_self_url: properly strip out GET params
- readability: depend on psr/http-factory
- readability: add missing dependencies
- Merge branch 'master' of git.tt-rss.org:fox/tt-rss
- use correct namespace for forked readability-php
- add missing files for forked idiorm