Display all headers in project view of IDEs.

Finally makes development with QtCreator usable.

src/MagnumPlugins/AnyImageImporter/CMakeLists.txt

@@ -29,7 +29,9 @@ set(AnyImageImporter_SRCS
 set(AnyImageImporter_HEADERS
     AnyImageImporter.h)
 
-add_library(AnyImageImporterObjects OBJECT ${AnyImageImporter_SRCS})
+add_library(AnyImageImporterObjects OBJECT
+    ${AnyImageImporter_SRCS}
+    ${AnyImageImporter_HEADERS})
 set_target_properties(AnyImageImporterObjects PROPERTIES COMPILE_FLAGS "${CMAKE_SHARED_LIBRARY_CXX_FLAGS}")
 
 add_plugin(AnyImageImporter ${MAGNUM_PLUGINS_IMPORTER_DEBUG_INSTALL_DIR} ${MAGNUM_PLUGINS_IMPORTER_RELEASE_INSTALL_DIR}