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.cpp

@@ -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
@@ -42,10 +42,11 @@ namespace Winix
 
 BaseThread::BaseThread() : thread_signal(PTHREAD_COND_INITIALIZER)
 {
-	synchro         = 0;
-	thread_id       = 0;
-	work_mode       = 0;
-	wake_up_was_called = false;
+	synchro              = nullptr;
+	thread_id            = 0;
+	work_mode            = 0;
+	wake_up_was_called   = false;
+	main_model_connector = nullptr;
 }
 
 
@@ -66,6 +67,12 @@ void BaseThread::set_main_file_log(pt::FileLog * file_log)
 }
 
 
+void BaseThread::set_main_model_connector(morm::ModelConnector * main_model_connector)
+{
+	this->main_model_connector = main_model_connector;
+}
+
+
 void BaseThread::Mode(int mode)
 {
 	work_mode = mode;