Qt Creator CMake port

Based on Tobias Hunger's work from a few months ago.

The CMake configuration needs libclang and Qt paths specified as
CMAKE_PREFIX_PATH.

Auto tests are run with "ctest". At the moment the pass rate is 87%.

Change-Id: Iba98e39bf22077d52706dce6c85986be67a6eab0
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/imageviewer/CMakeLists.txt

@@ -0,0 +1,15 @@
+add_qtc_plugin(ImageViewer
+  DEPENDS OptionalSvg
+  PLUGIN_DEPENDS Core
+  SOURCES
+    exportdialog.cpp exportdialog.h
+    imageview.cpp imageview.h
+    imageviewer.cpp imageviewer.h
+    imageviewerconstants.h
+    imageviewerfactory.cpp imageviewerfactory.h
+    imageviewerfile.cpp imageviewerfile.h
+    imageviewerplugin.cpp imageviewerplugin.h
+    imageviewertoolbar.ui
+    multiexportdialog.cpp multiexportdialog.h
+  EXPLICIT_MOC imageviewer.h
+)