Use Composer to manage all the PHP dependencies in development

• Integrate all possible dependencies via composer
• Use https://github.com/Comcast/php-legal-licenses to merge all so integrated licenses in one license to be confirmed with the updater
• deploy all integrated content in one own zip (which can provide the above merged license as license in the current dependencies json
• Cleanup mittagqi_meta
• Cleanup application.ini
• Cleanup up dependencies.json
• Cleanup library directories
• Improve install-and-update script, so that installations out there are cleaned up automatically
  • Separate todo, should be integrate in installer as separate command, automatic deletion is dangerous, therefore the filetobedeleted list was updated.

TODO After Release:

• Adopt TMUE and BEOSPHERE
• Cleanup install-packages