Various fixes for skin styling.
Remove unnecessary alignment
Merge branch 'master' into fordemo-backport-clean

Conflicts:
	src/widget/wpushbutton.cpp
Allow the use of properties to change styling of pushbuttons

CSS can be used that looks like:
(hash)MyButton[displayValue="0"] { }
Move the unpolish/polish calls outside paint, because they call paint.
Merge branch 'master' into fordemo-backport-clean
Allow widget stacks to save their current page.

Usage:

<WidgetStack currentpage="[EffectRack1],current" persist="true">

The exact name of the CO can be changed of course.
use the property that has been created in pushbutton
Merge pull request #195 from ywwg/fordemo-backport-clean

Various fixes for skin styling.