Handled performance issues and bugs noticed during testing of refs #319 / refs #322

* discussion: https://dev.vatsim-germany.org/boards/22/topics/2027?r=2040#message-2040
* fixed bug with ATC station component, wrong signals for booked stations
* booked stations loading to frequently (for each minor change such as online), changed to timestamp based concept
* update booked stations with receiving ATIS/voiceroom to online
* CDigestSignal class: new class and methods for collecting signals, avoiding too many signals - one of the cures for the performance issues
* fixed bug found during testing, missing start for timers when connecting to network

src/blackmisc/digestsignal.cpp

@@ -0,0 +1,36 @@
+/* Copyright (C) 2013
+ * swift project Community / Contributors
+ *
+ * This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
+ * directory of this distribution and at http://www.swift-project.org/license.html. No part of swift project,
+ * including this file, may be copied, modified, propagated, or distributed except according to the terms
+ * contained in the LICENSE file.
+ */
+
+#include "digestsignal.h"
+
+namespace BlackMisc
+{
+
+    void CDigestSignal::ps_inputSignal()
+    {
+        if (m_timer.isActive())
+        {
+            m_timer.start();
+        }
+
+        m_inputsCount++;
+        if (m_inputsCount >= m_maxInputsPerDigest)
+        {
+            ps_timeout();
+        }
+    }
+
+    void CDigestSignal::ps_timeout()
+    {
+        m_timer.stop();
+        m_inputsCount = 0;
+        emit digestSignal();
+    }
+
+} // namespace