Bugfix/#125 license for manifest

Bug fix

See #125 (closed) for a description.

The license key on Manifest level now provides an array of License Objects instead of a simple string. To achieve this, the XML based structure of the manifest data has been moved to maps. Additionally, the module has been slightly refactored.

In this course, another minor bug ("support" key having an object as value instead of an array of objects) has been fixed.

Summary

Compliance to “Definition of Done”

• Unit tests passed
• Code reviewed
• Product Owner accepts the User Story

Changelog

• I added a statement to the CHANGELOG.

Version number

• I bumped the version number in build.properties.

Readme and general docs

• I updated the README (if applicable) and kept the docs up to date.

Closes

Closes #125 (closed)

/cc Mathias Göbel, Frank Schneider, Michelle Weidling