Preventing loosing keyboard focus by editor.
When you write your code in editor sometimes you want to rotate or move object
on 3D view, but due stealing focus by this widget it is quite tedious.
You need additional mouse click to return focus to editor and search line where
you last edited. This behavior is not neccessary as we can interpret keyboard
events globally (in MainWindow) and send commands to 3D view.

Console window need ClickFocus to show context menu.

Zoom In/Out 3D view is assigned to CTRL+[ and CTRL+]. Adding also additional
shortcut to zoom in editor font CTRL+= (with CTRL++ SHIFT is necessary).
Merge pull request #752 from qSLX/master

Preventing losing keyboard focus by editor.