Check licenses of all dependent packages

• Probably we can use a tool like Fossa or maybe s.th. from Gitlab.
• Check for copy-left code (GPL, etc.). Needs to be removed!
• Weak Copy-Left is fine

To be specific, the analysis should be transparent and (sort of) reproducible. Therefore, the output should be

• A full list of all software packages involved in the WESkit execution and deployment including their license.
• A description of how this data was collected (which tools were used).

All results should be added to this issue.