Don't show morphs when exporting presentation as png

[monasobh]

As a presentation creator, I want to be able to export a presentation as a png without me seeing all the morphs. The screen is currently wildly jumping arount (going into fullscreen etc.)

• [ ] notify me, whenever the presentation finished exporting as a png

Estimated effort:

[LeonMatthes]

Technical problem: Morphs need to rendered and layoutet at the highest possible resolution. So the world needs to do one step possible solution: use a different world