EXP-225 FIX Add debug setting to quit the viewer after N seconds of AFK behavior.

Viewer specific setting for this feature including default value in settings file

indra/newview/app_settings/settings.xml

@@ -6403,6 +6403,17 @@
       <key>Value</key>
       <real>0.0</real>
     </map>
+    <key>QuitAfterSecondsOfAFK</key>
+    <map>
+      <key>Comment</key>
+      <string>The duration allowed after being AFK before quitting.</string>
+      <key>Persist</key>
+      <integer>1</integer>
+      <key>Type</key>
+      <string>F32</string>
+      <key>Value</key>
+      <real>0.0</real>
+    </map>
     <key>QuitOnLoginActivated</key>
     <map>
       <key>Comment</key>

indra/newview/llappviewer.cpp

@@ -3569,6 +3569,18 @@ void LLAppViewer::idle()
 		}
 	}
 
+	// debug setting to quit after N seconds of being AFK - 0 to never do this
+	F32 qas_afk = gSavedSettings.getF32("QuitAfterSecondsOfAFK");
+	if (qas_afk > 0.f)
+	{
+		// idle time is more than setting
+		if ( gAwayTriggerTimer.getElapsedTimeF32() > qas_afk )
+		{
+			// go ahead and just quit
+			LLAppViewer::instance()->forceQuit();
+		}
+	}
+
 	// Must wait until both have avatar object and mute list, so poll
 	// here.
 	request_initial_instant_messages();