This might stop random crashes when closing QmlDesigner.

Task-number: BAUHAUS-510

Reviewed-by: kh1

* made them a few pixels smaller
* they now animate when collapsed
* they no longer fade out when an error is reported

Reviewed-by: thorbjorn

Or when the list is empty because it is not supported, like when
creating a new project.

Reviewed-by: Friedemann Kleint <Friedemann.Kleint@nokia.com>

Reviewed-by: erik verbruggen

Reviewed-by: Thorbjørn

Reviewed-by: kh1

We now do as much as possible lazy initialisation, e.g only start the
full text search indexer if we really access the search widget. Also
moved the QFutur progress into the search widget. Changed all ctors to
be called without an argument, since we share the help engines from
help manager all over the place. Make use of the fact that we only need
to call setupData on the gui engine if we access the help mode, otherwise
all data is fetched thru the core engine whichs setupData is really fast.

Currently we can only retrieve a list of keywords from the help index
model, which is slow and needs a fully setup gui help engine. This needs
to be implmeneted in the help lib though.

Add some more statics that can return the class instance,
implements a gui help engine and the bookmark manager for
easier sharing.

The Maemo 5 window manager already makes sure applications always run
maximized.

Reviewed-by: Robert Griebl

Reviewed-by:Leena Miettinen

This overrides the styles default behavior for disabled
icons and simply generates their grayscale equivalent so
they look a bit crisper.

Reviewed-by: dt
Reviewed-by: Friedemann Kleint

Reviewed-By: hunger
Task-Nr: QTCREATORBUG-670

Reviewed-By: hunger

Reviewed-By: Friedemann Kleint

Reviewed-By: hunger

Designer should still have editor manager context.

Reviewed-by: con

While before you had to call add, then remove for each context id and
then call update, now you call updateAdditionalContexts with a list of
contexts to remove and add. It has the update step built in.

Reviewed-by: con