Prepare the resources to be used with Composer
Move the Contao library to its own Git repository
Load the PHP classes via the Composer PSR-4 autoloader
Do not create `.htaccess` files in the database updater anymore
Flatten the directory structure (thanks to PSR-4)
Adjust the array key in the debug output
Move some classes from the core module into the library
Correctly restore the `index.html` files when purging script folders
Port contao/core@d1279d5e0ac0b7d1051c8ca0578674a220be8070 from the LTS version
Do not offer to drop tables or fields if the safe mode is active (see contao/core#7085)
Port contao/core@6a8601682f40a9224bff228a6607d36b0e52b317
Change the key of the "composerized" classes in the debug array
Make `System::convertXlfToPhp()` public
Do not explicitly use classes from within the same namespace
Use the new PHP 5.4 array shorthand notation
Use the CSS class `active` instead of `current` in the pagination menu (see contao/core#5947)
Use a `<strong>` tag instead of a `<span>` tag for active menu items (see contao/core#6336)
Support scopes in the `Message` class (see contao/core#6558)
Replace the `TL_PATH` constant (see contao/core#5347)
Port the changes from contao/core@4b294e9ebe0a0df765ebbd4f880c8703e0bd913a