This version introduces editing support. You can now create, update and
delete sessions and questions in ARSnova Presenter. Furthermore,
support for Just-in-Time-Teaching has been implemented which allows you
to define questions to be answered before lecture. To keep the user
interface clean and only show the functionality needed when presenting,
you can switch between different modes for these tasks.

The full list of changes:
* Internationalization: The user interface is now translatable
  (currently English and German are supported).
* Accessibility: Presenter is now completely usable via keyboard.
* Exporting: Sessions and questions can be exported to JSON format.
* a lot of usability improvements, bug fixes and changes under the hood