Added missing messages (taken from https://github.com/notepad-plus-plus/notepad-plus-plus/blob/287ce9ec147d6d64224d8990f99385f57a240df4/PowerEditor/src/MISC/PluginsManager/Notepad_plus_msgs.h#L546)

Author: kbilsted

Visual Studio Project Template C#/NppPluginNETHelper.cs

@@ -629,6 +629,15 @@ public enum NppMsg : uint
             DOCSTAUS_BUFFERDIRTY = 2,
 
         NPPN_DOCORDERCHANGED         = (NPPN_FIRST + 17),  // To notify plugins that document order is changed
+        NPPN_SNAPSHOTDIRTYFILELOADED = (NPPN_FIRST + 18),  // To notify plugins that a snapshot dirty file is loaded on startup
+        NPPN_BEFORESHUTDOWN          = (NPPN_FIRST + 19),  // To notify plugins that Npp shutdown has been triggered, files have not been closed yet
+        NPPN_CANCELSHUTDOWN          = (NPPN_FIRST + 20),  // To notify plugins that Npp shutdown has been cancelled
+        NPPN_FILEBEFORERENAME        = (NPPN_FIRST + 21),  // To notify plugins that file is to be renamed
+        NPPN_FILERENAMECANCEL        = (NPPN_FIRST + 22),  // To notify plugins that file rename has been cancelled
+        NPPN_FILERENAMED             = (NPPN_FIRST + 23),  // To notify plugins that file has been renamed
+        NPPN_FILEBEFOREDELETE        = (NPPN_FIRST + 24),  // To notify plugins that file is to be deleted
+        NPPN_FILEDELETEFAILED        = (NPPN_FIRST + 25),  // To notify plugins that file deletion has failed
+        NPPN_FILEDELETED             = (NPPN_FIRST + 26),  // To notify plugins that file has been deleted		
     }
 
     public enum NppMenuCmd : uint