Add NightShot source

include/app_messages.hpp

@@ -0,0 +1,11 @@
+#pragma once
+
+#include <windows.h>
+
+inline constexpr UINT WM_NIGHTSHOT_SCREENSHOT_COPIED = WM_APP + 12;
+inline constexpr UINT WM_NIGHTSHOT_OPEN_SETTINGS = WM_APP + 13;
+inline constexpr UINT WM_NIGHTSHOT_SETTINGS_CHANGED = WM_APP + 14;
+inline constexpr UINT WM_NIGHTSHOT_UPLOAD_FINISHED = WM_APP + 15;
+inline constexpr UINT WM_NIGHTSHOT_BEGIN_GIF = WM_APP + 16;
+inline constexpr UINT WM_NIGHTSHOT_GIF_FINISHED = WM_APP + 17;
+inline constexpr UINT WM_NIGHTSHOT_SCREENSHOT_SAVED = WM_APP + 18;