Move app orchestration into app target

cmake/PanoPainterSources.cmake

@@ -1,14 +1,6 @@
 set(PP_LEGACY_APP_SOURCES
     src/abr.cpp
     src/action.cpp
-    src/app.cpp
-    src/app_cloud.cpp
-    src/app_commands.cpp
-    src/app_dialogs.cpp
-    src/app_events.cpp
-    src/app_layout.cpp
-    src/app_shaders.cpp
-    src/app_vr.cpp
     src/asset.cpp
     src/bezier.cpp
     src/binary_stream.cpp
@@ -55,6 +47,14 @@ set(PP_LEGACY_APP_SOURCES
 )
 
 set(PP_PANOPAINTER_APP_SOURCES
+    src/app.cpp
+    src/app_cloud.cpp
+    src/app_commands.cpp
+    src/app_dialogs.cpp
+    src/app_events.cpp
+    src/app_layout.cpp
+    src/app_shaders.cpp
+    src/app_vr.cpp
     src/version.cpp
 )