Possibility to generate for a specific model from the generators overview

[aedelmann]

At the moment, a vorto user has to search for a model first, go to the details page and choose from a list of generators.

To increase the usability of the repository, a user can click on the desired generator from the generators overview. A popup opens which allows the user to search for information models and choose the model that the user wants to generate code for.
Moreover, in the search result list, a user has a way to directly generate to other platform formats.