[KDev4] Opening project with real ASync way

[dukju ahn]

I've implemented async way of openning project. Attatched files
are patch. The complete ProjectController was attached as a bunus.
because the patch file are hard to read for ProjectController.
I excluded Job classes from patch so that we can
focus only on KDevelop::Project, and ProjectController.
I used threadweaver for job class.

It works very well. But there is one problem. Because now
ProjectBaseItems are created on separated thread, we can't invoke
setIcon() at the constructor of ProjectBaseItem and its subclasses.
Otherwise it segfaulted. Especially KIO::pixmapForUrl() was the reason
of crash.

One solution would be to invoke setIcon() in the slot connected to
KJob::done(). Starting from top item, we go recursively into every
children and call childItem->setIcon().

Are Anyone against from this?
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