Integrate Calliope mini Blocks as another Editor

[joernalraun]

It would be good if https://blocks.calliope.cc could be integrated in a next version.
It should be programmed directly from the browser, however the connection abruptly stops once it has been connected.
As described here: https://forum.calliope.cc/t/android-calliope-und-scratch/2908
Maybe we can find the problem, the link to the editor could then just link to a web view...