h5p element

[mikebarkmin]

H5p is gaining more and more popularity. At the moment you can use the embed element and an external hosting service for h5p like lumi. But it would be great, if you can have everything in your control. Therefore I propose a h5p element. It could be based on this project: https://github.com/tunapanda/h5p-standalone

[mikebarkmin]

There is one thing I do not like about H5P. It needs an external editor. It would be nice to find an alternative, which can be configured directly in the markdown files.

[mikebarkmin]

Implemented in #964