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/core/basethread.h

@@ -5,7 +5,7 @@
  */
 
 /* 
- * Copyright (c) 2010-2019, Tomasz Sowa
+ * Copyright (c) 2010-2022, Tomasz Sowa
  * All rights reserved.
  * 
  * Redistribution and use in source and binary forms, with or without
@@ -57,6 +57,7 @@ public:
 	void set_main_log_buffer(pt::WTextStream * log_buffer);
 	void set_main_file_log(pt::FileLog * file_log);
 
+	void set_main_model_connector(morm::ModelConnector * main_model_connector);
 
 	// work mode
 	// we have two modes:
@@ -105,11 +106,13 @@ protected:
 
 	// logger for the main thread
 	Log main_log;
+	// log from WinixBase is meant to be used by the second thread
 
-	// log from WinixBase is meant to be used by the other thread
+	// model connector for the main thread
+	// model_connector from the based class WinixModelDeprecated is meant to be used by the second thread
+	morm::ModelConnector * main_model_connector;
 
 
-protected:
 
 
 	// signal came (work mode = 0 - default)