Support Various Licence files / Disclamers

[Andries-Smit]

When questioning "Add a license"; what ever the licence chosen it always add the Apache 2 licence file in you project.

https://github.com/mendix/generator-mendix/blob/master/generators/app/index.js#L220

Would be nice if there are multiple way of adding the licence headers / disclaimers. https://www.smashingmagazine.com/2010/03/a-short-guide-to-open-source-and-similar-licenses/

This issue got me into trouble before.... difficult client... however he was right.

An interesting question to ask the Mendix legal guys; What is the right licencing structure for a widgets. Specially when it uses other libraries are (Mendix API, dojo, Jquery, and others).