add WINIX_PLUGIN_QUIT and WINIX_QUIT plugins messages

While here:
- rename WINIX_CLOSE to WINIX_PREPARE_TO_CLOSE

winixd/core/pluginmsg.h

@@ -107,10 +107,14 @@ namespace Winix
 // in l1 you have the old session id
 #define WINIX_SESSION_REMOVED				30029
 
-// the winix is closing
+// the winix is being closing
 // there is not any sessions available (cur->session is null)
 // session pointer is null
-#define WINIX_CLOSE							30040
+#define WINIX_PREPARE_TO_CLOSE				30040
+
+// winix has been closes, all other threads are stopped now, this is a last message for the main thread
+// there is not any sessions available (cur->session is null)
+#define WINIX_QUIT							30041
 
 // preparing to remove a file (rm function)
 // in p1 you have a pointer to the Item struct (file)
@@ -142,6 +146,11 @@ namespace Winix
 // session pointer is null
 #define WINIX_PLUGIN_INIT					30080	
 
+// winix is ready to remove a plugin
+// you can clear some plugin data here e.g. controllers
+// all other threads are stopped now
+#define WINIX_PLUGIN_QUIT					30081
+
 // here you can add your own mount point, file systems, mount parameters
 // for adding a new mount type call: system->mounts.AddMountType("new_mount_name")
 // session pointer is null