improve frontend of emacs, ckeditor, tinymce, nicedit, meta and env functions

Improves in emacs:
- use htmx to send content to the controller
- show txt and formatted_txt content in the second panel
- show two tabs if "tabs" winix parameter is used
- add an option to show either one or two panels
- correctly resize the editor window (F11) when two panels are shown

Improves in ckeditor:
- use htmx to send content to the controller
- do not check automatically for ckeditor update

Improves in tinymce/nicedit/meta/env:
- use htmx to send content to the controller

while here:
- change PascalCase to snake_case in meta/env controllers
- update CodeMirror editor to 5.65.16
- udpate Showdown (markdown to html converter) to 2.1.0

winixd/functions/ckeditor.cpp

@@ -5,7 +5,7 @@
  */
 
 /* 
- * Copyright (c) 2008-2014, Tomasz Sowa
+ * Copyright (c) 2008-2024, Tomasz Sowa
  * All rights reserved.
  * 
  * Redistribution and use in source and binary forms, with or without
@@ -36,14 +36,10 @@
 #include "functions.h"
 
 
-
-namespace Winix
+namespace Winix::Fun
 {
 
 
-namespace Fun
-{
-
 Ckeditor::Ckeditor()
 {
 	fun.url = L"ckeditor";
@@ -57,7 +53,16 @@ void Ckeditor::init()
 
 bool Ckeditor::has_access()
 {
-	return functions->fun_emacs.has_access();
+	FunctionBase * emacs = functions->Find(L"emacs");
+
+	if( emacs )
+	{
+		return emacs->has_access();
+	}
+	else
+	{
+		return false;
+	}
 }
 
 
@@ -73,13 +78,20 @@ void Ckeditor::make_get()
 
 void Ckeditor::make_post()
 {
-	functions->fun_emacs.make_post();
-}
+	FunctionBase * emacs = functions->Find(L"emacs");
 
+	if( emacs )
+	{
+		emacs->make_post();
+	}
+	else
+	{
+		log << log2 << "Ckeditor: I cannot save your content, there is no emacs function available" << logend;
+	}
+}
 
 
 
 } // namespace
 
-} // namespace Winix