Liveedit virtualconsole

(this also needs https://github.com/mcallegari/qlcplus/pull/373 to work, it's very random as-is !)

Branch to test easily : https://github.com/plugz/qlcplus/tree/liveedit-vc-TEST

Discussion here too :
https://sourceforge.net/p/qlcplus/discussion/general/thread/e92f4875/

Open to remarks/suggestions :)