QQuickWidget: Fix SizeViewToRootObject

There were two problems: 1) QWidget does not have a default size of (0,0)
or (1,1), but uses WA_Resized. 2) event() would eat timer events without
checking the timerId.

Change-Id: I355acbb10d3d5073e117c29de18bb94857881141
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>
Cleanup: Remove last traces of QQmlScript

What remains is the code for removing .pragma from script source code (and
replacing it with white-space to preserve line/column numbers).  The previous
code even returned the value of the pragmas, but for the remaining caller sites
that value isn't used, so we can just return void.

Change-Id: I16db15da236970660b817d6c4493005365a7a1af
Reviewed-by: Lars Knoll <lars.knoll@digia.com>