[WIP] Applied CCA-CodeStyle and CCA-Build-System

I've startet to rework the attribute_url with the ccabs and the cca-codestyle. I added a base unittest.
Something is done, but I'am confused about the author-check. It says the following:

```
author-validation:
[author-validation] The file /Applications/MAMP/htdocs/metamodels/contao-extensions/metamodels-attribute_url/contao/config/autoload.php is mentioning superfluous author(s):
[author-validation] Andreas Isaak <info@andreas-isaak.de>
[author-validation] Stefan Heimes <stefan_heimes@hotmail.com>
[author-validation] The file /Applications/MAMP/htdocs/metamodels/contao-extensions/metamodels-attribute_url/contao/config/autoload.php is not mentioning its author(s):
[author-validation] Christopher Boelter <christopher@boelter.eu>
[author-validation] The file /Applications/MAMP/htdocs/metamodels/contao-extensions/metamodels-attribute_url/contao/config/config.php is mentioning superfluous author(s):
[author-validation] Andreas Isaak <info@andreas-isaak.de>
[author-validation] Stefan Heimes <stefan_heimes@hotmail.com>
[author-validation] The file /Applications/MAMP/htdocs/metamodels/contao-extensions/metamodels-attribute_url/contao/config/config.php is not mentioning its author(s):
[author-validation] Christopher Boelter <christopher@boelter.eu>
[author-validation] The file /Applications/MAMP/htdocs/metamodels/contao-extensions/metamodels-attribute_url/contao/dca/tl_metamodel_attribute.php is mentioning superfluous author(s):
[author-validation] Andreas Isaak <info@andreas-isaak.de>
[author-validation] Stefan Heimes <stefan_heimes@hotmail.com>
[author-validation] The file /Applications/MAMP/htdocs/metamodels/contao-extensions/metamodels-attribute_url/contao/dca/tl_metamodel_attribute.php is not mentioning its author(s):
[author-validation] Christopher Boelter <christopher@boelter.eu>
[author-validation] The file /Applications/MAMP/htdocs/metamodels/contao-extensions/metamodels-attribute_url/contao/dca/tl_metamodel_dcasetting.php is mentioning superfluous author(s):
[author-validation] Andreas Isaak <info@andreas-isaak.de>
[author-validation] Stefan Heimes <stefan_heimes@hotmail.com>
[author-validation] The file /Applications/MAMP/htdocs/metamodels/contao-extensions/metamodels-attribute_url/contao/dca/tl_metamodel_dcasetting.php is not mentioning its author(s):
[author-validation] Christopher Boelter <christopher@boelter.eu>
[author-validation] The file /Applications/MAMP/htdocs/metamodels/contao-extensions/metamodels-attribute_url/contao/dca/tl_metamodel_rendersetting.php is mentioning superfluous author(s):
[author-validation] Andreas Isaak <info@andreas-isaak.de>
[author-validation] Stefan Heimes <stefan_heimes@hotmail.com>
[author-validation] The file /Applications/MAMP/htdocs/metamodels/contao-extensions/metamodels-attribute_url/contao/dca/tl_metamodel_rendersetting.php is not mentioning its author(s):
[author-validation] Christopher Boelter <christopher@boelter.eu>
[author-validation] The file /Applications/MAMP/htdocs/metamodels/contao-extensions/metamodels-attribute_url/src/MetaModels/Attribute/Url/Url.php is mentioning superfluous author(s):
[author-validation] Andreas Isaak <info@andreas-isaak.de>
[author-validation] Stefan Heimes <stefan_heimes@hotmail.com>
[author-validation] The file /Applications/MAMP/htdocs/metamodels/contao-extensions/metamodels-attribute_url/src/MetaModels/Attribute/Url/Url.php is not mentioning its author(s):
[author-validation] Christopher Boelter <christopher@boelter.eu>
[author-validation] The file /Applications/MAMP/htdocs/metamodels/contao-extensions/metamodels-attribute_url/src/MetaModels/DcGeneral/Events/UrlWizardHandler.php is mentioning superfluous author(s):
[author-validation] Christian Schiffler <c.schiffler@cyberspectrum.de>
[author-validation] The file /Applications/MAMP/htdocs/metamodels/contao-extensions/metamodels-attribute_url/src/MetaModels/DcGeneral/Events/UrlWizardHandler.php is not mentioning its author(s):
[author-validation] Christopher Boelter <christopher@boelter.eu>
[author-validation] The file /Applications/MAMP/htdocs/metamodels/contao-extensions/metamodels-attribute_url/tests/MetaModels/Test/Attribute/Url/UrlTest.php is mentioning superfluous author(s):
[author-validation] Christian Schiffler <c.schiffler@cyberspectrum.de>
[author-validation] The file /Applications/MAMP/htdocs/metamodels/contao-extensions/metamodels-attribute_url/tests/MetaModels/Test/Attribute/Url/UrlTest.php is not mentioning its author(s):
[author-validation] Christopher Boelter <christopher@boelter.eu>
[author-validation] The file /Applications/MAMP/htdocs/metamodels/contao-extensions/metamodels-attribute_url/tests/bootstrap.php is not mentioning its author(s):
[author-validation] Christopher Boelter <christopher@boelter.eu>

```
It wants to remove all the old author information, is that right?