hgview #107995 refactorize qt code [in-progress]

Sope code of the qt code is unused or legacy.
The code shall also be simplified.

appeared in<not specified>
done in1.9.0
load left5.000
closed by<not specified>
patch[qt4] make pylint a little happier [rejected][qt4] make pylint a little more happy [applied][qt4] move scintilla code into dedicated class [applied][qt4] rename actions container of hg-scintilla object [applied][qt4] move scintilla initialization into to dedicated class [applied]