Ensuring Gtk.jl responsivity

Hey @xor0110,
this has been a long term issue, but with Julia 1.3 and its threading capabilities it actually works. Have a look at this example.

The point is to spawn the thread and put all UI code into an idle_add.

One missing piece in that code is to spawn the thread at a different thread than the master thread. There is some package exactly for that purpose, but I have not tried it yet (you need to search in the forum, I do not remember the name).

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