allow a request to be processed in a job

Now we allow a request to be passed into a job queue,
and after the job finishes the request is passed into
a controller again. In order to achieve this we have
a requests queue in System, when we put a request
to the job this Request structure is preserved in the
queue and for a new request a new Request is added to
the queue.

while here:
- remove App::Lock()/Unlock(), use scoped locking
- fix: Plugin now has a Call method which takes ModelConnector
  and a logger (used in multithreaded environment)
- BaseThread has a main_model_connector pointer
  to the main (from the main thread) model connector
- the FastCGI structure fcgi_request moved from App to Request
- some methods for handling requests moved from App to Request
- small refactoring in main.cpp
- add Http class (a http client)

winixd/functions/functionparser.h

@@ -5,7 +5,7 @@
  */
 
 /* 
- * Copyright (c) 2008-2021, Tomasz Sowa
+ * Copyright (c) 2008-2022, Tomasz Sowa
  * All rights reserved.
  * 
  * Redistribution and use in source and binary forms, with or without
@@ -40,7 +40,7 @@
 #include "core/winixmodeldeprecated.h"
 #include "db/db.h"
 #include "core/cur.h"
-#include "core/system.h"
+#include "core/dirs.h"
 
 
 namespace Winix
@@ -60,13 +60,15 @@ public:
 	/*
 	 * if the method returns false then cur->request->http_status will be already set to a specific error
 	 */
-	bool Parse(Cur * pcur, Db * pdb, Functions * pfunctions, System * psystem);
+	bool Parse(Request * request, Dirs * dirs, Functions * functions);
+	bool ParseDirs(Request * request, Dirs * dirs);
+
 
 private:
 
 	Db        * db;
-	Cur       * cur;
-	System    * system;
+	Request   * request;
+	Dirs      * dirs;
 	Functions * functions;
 
 	const wchar_t * path;
@@ -79,6 +81,7 @@ private:
 	void SkipSlashes();
 
 	void PrintCurrentDirs();
+	void ParseDirs();
 	bool ParseDirsItemFunction();
 	void ParseParams();
 	void ParseAnchor();