added a new item content type: markdown

- emacs editor has an option to select markdown, now it has two planes: one for content editing and the other to show preview
- CodeMirror editor updated to 5.64.0
- to convert markdown to html we use showdown https://github.com/showdownjs/showdown (conversion is done on the client side)

winixd/functions/functions.h

@@ -180,9 +180,9 @@ public:
 	bool CheckAbuse(SLog * slog = nullptr);
 
 	// !! dac lepsze nazwy
-	void ReadItemFilterHtml(Item & item);
-	void ReadItemContent(Item & item, const std::wstring & content_type);
-	void ReadItemContentWithType(Item & item);
+	void ReadItemFilterHtml(const std::wstring & html, std::wstring & html_filtered);
+	void ReadItemContent(Item & item);
+	void ReadItemContentType(Item & item);
 
 	// if item.url is not empty and there is not a post variable "url"
 	// then the item.url will not be changed
@@ -205,7 +205,6 @@ private:
 	Templates * templates;
 	SessionManager * session_manager;
 
-	std::wstring temp;
 	pt::HTMLParser html_filter;
 	std::wstring link_to_temp;