Feature: #68184 - Paths to typo3/cms package and document root can be specified in composer.json

See Issue #68184

Description

With the new composer installer it is possible to specify the path of the document root and also the path of the typo3/cms package.

It can be specified in the extra section of your composer root package like that:

{
        "repositories": [
                { "type": "composer", "url": "http://composer.typo3.org/" }
        ],
        "name": "typo3/cms-base-distribution",
        "description" : "TYPO3 CMS Base Distribution",
        "license": "GPL-2.0+",
        "config": {
                "vendor-dir": "Packages/Libraries",
                "bin-dir": "bin"
        },
        "require": {
                "typo3/cms": "dev-master"
        },
        "require-dev": {
                "mikey179/vfsStream": "1.3.*@dev",
                "phpunit/phpunit": "~4.4.0",
                "twbs/bootstrap": "3.3.*",
                "fortawesome/font-awesome": "4.2.*"
        },
        "extra": {
                "typo3/cms": {
                        "cms-package-dir": "{$vendor-dir}/typo3/cms",
                        "web-dir": "web"
                }
        }
}

Impact

When specifying the configuration like mentioned above, the directory structure of a composer install will change.