[cedricvogel-leo]

Macro part of P18 phase 1. It needs glpython-edu/glpython-editor#29 (embed protocol version 4) to be merged and deployed first. Before that, nothing changes: an older embed doesn't announce stop.

Change

• While Python is busy for more than a moment (a program, a REPL input, Tests), ▶ Ausführen becomes ■ Stoppen in the same place. It keeps the button's width, so the row doesn't move.
• Clicking it sends glpython:stop: Python restarts, the code stays, and the console notes it («Gestoppt. Python wurde neu gestartet.»).
• Protocol version 4 with embeds that announce capabilities.stop. The macro sends each embed the newest version both understand (embedVersion()).
• A fix on the way: the macro accepted the embed's answers only in versions 1 and the newest. The embed answers in the version the macro last used, so an embed that answered in version 2 or 3 was ignored. It now accepts 1–4.
• README: one paragraph in «Buttons and profiles».

Tested in the hosted LiaScript player, the macro pointed at #29's embed built locally:

Macro / embed	While while …: print(…) runs	Stop
this / #29	«■ Stoppen», width 111 → 111px, Tests stays at x 447, output streams	note in the console, back to «▶ Ausführen»
this / #29, while True: pass typed into the REPL	«■ Stoppen»	back to «▶ Ausführen»
this / deployed embed (v3)	«▶ Ausführen» as before	–
main / #29	«▶ Ausführen», output streams	–

Coordination with P17. #17, #18 and this branch merge together without conflicts (checked locally, check-macro passes). I moved the busy handler next to, not into, #17's resize line.

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