Merge branch 'prep-release-3.1.1' into develop-ascraeus
* prep-release-3.1.1:
[ticket/13271] Disable CC sender feature for anonymous users
[prep-release-3.1.1] Add 3.1.1 CHANGELOG
[prep-release-3.1.1] Add 3.1.1 migration file
[ticket/13263] Make sure default style exists and clean up code
[ticket/13263] Only install/set prosilver if no style available
[ticket/13263] Use prosilver as default style if user's style doesn't exist
[ticket/security-164] Correctly format page_name
[ticket/security-164] Sanitize all global variables in symfony_request class
[ticket/13248] Use functional framework login method in tests
[ticket/13248] Correctly pass provider name
[ticket/13248] Always use provider collection for getting provider
[ticket/13248] Allow specifying different auth provider in provider collection
[ticket/13248] Use auth provider collection for getting provider
[ticket/13262] Mention htaccess file when updating from 3.0 to 3.1
[ticket/13267] Update Automatic Update instructions to include vendor directory
[ticket/13268] Properly append ternary result in get_existing_indexes()
[prep-release-3.1.1] Update version number to 3.1.1
Merge remote-tracking branch 'github-security/ticket/security-164-alt' into prep-release-3.1.1
* github-security/ticket/security-164-alt:
[ticket/security-164] Correctly format page_name
[ticket/security-164] Sanitize all global variables in symfony_request class
