Add support for saving embedded album covers

Fixes #286

src/CMakeLists.txt

@@ -34,6 +34,7 @@ set(SOURCES
   core/thread.cpp
   core/urlhandler.cpp
   core/utilities.cpp
+  core/imageutils.cpp
   core/iconloader.cpp
   core/qtsystemtrayicon.cpp
   core/standarditemiconloader.cpp