core, frontend: Add 'Dump CXI file' option

Right click on an application in the Select Contents dialog.

src/frontend/CMakeLists.txt

@@ -9,11 +9,13 @@ endif()
 file(GLOB_RECURSE THEMES ${PROJECT_SOURCE_DIR}/dist/themes/*)
 
 add_executable(threeSD
+  helpers/import_job.cpp
+  helpers/import_job.h
+  helpers/progressive_job.cpp
+  helpers/progressive_job.h
   import_dialog.cpp
   import_dialog.h
   import_dialog.ui
-  import_job.cpp
-  import_job.h
   main.cpp
   main.h
   main.ui