Integrate license information and management
Currently TYPO3 Extensions don't have any information of the license used. This part gets very interesting when the extension acts as a wrapper for third party software (e.g. for phpMyAdmin). Other libraries have a non-commercial (free) and commercial (pay a fee once) license.
License conflicts and notes shall be displayed in a dialog popup and maybe confirmed by the administrator. The ext_emconf.php gets extended by "license" and "licenseNote" properties.
(issue imported from #M9451)