Patch for thumbnail update in layerbox

[Sven Langkamp]

Hi,

the attached patch fixes bug https://bugs.kde.org/show_bug.cgi?id=220179

The the KisNodeGraphListener is extended by a method to notify about node
changes. Nodes call it when the systemLocked is turned off. I used
systemLocked as it only called once an operation is finished, so we don't do
updates that are not needed.
The node model manages a queue for the nodes that will be updated after a
one second timeout.

Any comments?

Sven
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