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/env.h

@@ -40,11 +40,7 @@
 #include "space/spaceparser.h"
 
 
-namespace Winix
-{
-
-
-namespace Fun
+namespace Winix::Fun
 {
 
 
@@ -54,10 +50,10 @@ public:
 
 	Env();
 
-	bool has_access();
-	void make_post();
-	void make_get();
-	void clear();
+	bool has_access() override;
+	void make_post() override;
+	void make_get() override;
+	void clear() override;
 
 
 private:
@@ -66,13 +62,13 @@ private:
 	pt::Space space;
 	UserWrapper user_wrapper;
 
-	bool EditAdminEnv(const std::wstring & env_str);
-	bool EditEnv(const std::wstring & env_str);
+	bool edit_admin_env(const std::wstring & env_str);
+	bool edit_env(const std::wstring & env_str);
 
-	bool Parse(const std::wstring & env_str);
-	void SaveEnv();
+	bool parse(const std::wstring & env_str);
+	void save_env();
 
-	void RegisterModels();
+	void register_models();
 
 
 };
@@ -80,6 +76,4 @@ private:
 
 } // namespace
 
-} // namespace Winix
-
 #endif