Issue 470

[MarcinGladkowski]

All Submissions:

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

New Feature Submissions:

1. Does your submission pass tests?
2. Have you lint your code locally prior to submission?

Changes to Core Features:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your core changes, as applicable?
• Have you successfully ran tests with your changes locally?

Hi!
@icanhazstring

I based on specific TYPO3 packages. Example below:

vendor/composer/installed.php

        'typo3/cms-backend'' => array(
            // ...
            'type' => 'library',
            'install_path' => __DIR__ . '/../../public/typo3/sysext/backend',
           // ...
        ),

public/typo3/sysext/fluid/composer.json

{
	"name": "typo3/cms-backend",
	"type": "typo3-cms-framework",
        // ...
	"autoload": {
		"psr-4": {
			"TYPO3\\CMS\\Backend\\": "Classes/"
		}
	}
}

I decided to allow configure custom dependencies directory. I hope, I understand it correctly.
But there are other dependencies installed in vendor/ dir.

Ref: #470

[icanhazstring]

Just a small question otherwise looks good 👍

[icanhazstring]

Thanks 🙏