TYPO3 Core

Doing so is fully backwards compatible but has several benefits:

1. It will become possible for TYPO3 Console to replace this package so that not two but only one binary ends up in the bin directory
2. We can get rid of generating the proxy autoload.php file entirely because this package will be installed in vendor, where we know the location of the original autoload.php of the project
3. Using typo3/cms as root package for development, exposes the binary in bin/typo3 instead of typo3/sysext/core/bin/typo3