allow to upload files from the ckeditor

while here:
- update ckeditor to 4.21.0
- add a Sourcedialog plugin to the ckeditor

winixd/functions/upload.h

@@ -5,7 +5,7 @@
  */
 
 /* 
- * Copyright (c) 2010-2022, Tomasz Sowa
+ * Copyright (c) 2010-2023, Tomasz Sowa
  * All rights reserved.
  * 
  * Redistribution and use in source and binary forms, with or without
@@ -61,6 +61,7 @@ private:
 
 	std::wstring path;
 	bool is_jquery_upload;
+	bool is_ckeditor_upload;
 	magic_t magic_cookie;
 	pt::Space files;
 
@@ -75,7 +76,8 @@ private:
 	void UploadSingle();
 	void ResizeImage(Item & item);
 	void CreateThumb(Item & item);
-	void CreateAnswer();
+	void CreateJqueryUploadAnswer();
+	void CreateCkeditorUploadAnswer();
 
 	void InitMagicLibIfNeeded();
 	void CloseMagicLib();