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 ... based on their display names

Reviewed-by: Daniel Molkentin

 * In the addtargetdialog: Sort targets based on their display
   name when putting them into the combobox.

 * Set the first target to active in the addtargetdialog's
   target selection combobox
 * Disable the combobox if there is only one element in it.

The registration of the qml items have been recently moved from a static
context into QmlGraphicsItemModule::initialization . The Bauhaus Metainfo
initialization now ensures that this method is called first by
instantating a QmlEngine.

It's defined in qtcreator_plugin.pri anyway

Introduce multithread-locking to Core::MimeDatabase as it is
invoked from the indexer thread to sort apart headers and sources.
Add a convenience to operate on a sequence to avoid locking for each
file.

The code using OpenGL has already been removed in b6460f92

We need to kill the fadeins before fading out.
Otherwise we might get into weird states.

I added a zerotimer to make the sidebar emit
currentChanged only after it has been updated as
pressed.

Killed the divider lines for improved aestetics
Made the hover a bit more subtle

* I have simplified and animated the tool buttons a bit.
* The panel has been replaced by a very basic clean panel.
* The tool buttons have been animated.