[cedricvogel-leo]

Goes with glpython-editor#52: while stepping through a visualization, the block keeps one height, so the course page doesn't move.

• windowHeight: the macro passes window.innerHeight (the course window's height, which the iframe can't see). The embed caps the visualizer at 80% of it, and a taller step, such as a deep recursion in «Kasten», scrolls inside it.
• README: a paragraph for course authors after large.

Order and compatibility:

• Either PR can go first.
• An embed before #52 ignores the parameter.
• #52 without this PR uses the screen's height instead.

Going live: a patch version bump for the courses, so the new macro is loaded.

Tested in the LiaScript player (headless Chrome, window 800 px) against a local build of #52's embed, fakultaet(5) with @GLPython.eval(box), 59 steps:

• with #52, the iframe stays at 878 px at every step;
• with the current embed, it grows in seven sizes, from 447 to 1089 px.

check-macro passes.

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