created common startup project for mono & windows

MediaBrowser.Server.Startup.Common/EntryPoints/KeepServerAwake.cs

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+using MediaBrowser.Controller;
+using MediaBrowser.Controller.Plugins;
+using MediaBrowser.Controller.Session;
+using MediaBrowser.Model.Logging;
+using System;
+using System.Linq;
+using System.Threading;
+
+namespace MediaBrowser.Server.Startup.Common.EntryPoints
+{
+    public class KeepServerAwake : IServerEntryPoint
+    {
+        private readonly ISessionManager _sessionManager;
+        private readonly ILogger _logger;
+        private Timer _timer;
+        private readonly IServerApplicationHost _appHost;
+
+        public KeepServerAwake(ISessionManager sessionManager, ILogger logger, IServerApplicationHost appHost)
+        {
+            _sessionManager = sessionManager;
+            _logger = logger;
+            _appHost = appHost;
+        }
+
+        public void Run()
+        {
+            _timer = new Timer(obj =>
+            {
+                var now = DateTime.UtcNow;
+                if (_sessionManager.Sessions.Any(i => (now - i.LastActivityDate).TotalMinutes < 5))
+                {
+                    KeepAlive();
+                }
+
+            }, null, TimeSpan.FromMinutes(5), TimeSpan.FromMinutes(5));
+        }
+
+        private void KeepAlive()
+        {
+            var nativeApp = ((ApplicationHost)_appHost).NativeApp;
+
+            try
+            {
+                nativeApp.PreventSystemStandby();
+            }
+            catch (Exception ex)
+            {
+                _logger.ErrorException("Error resetting system standby timer", ex);
+            }
+        }
+
+        public void Dispose()
+        {
+            if (_timer != null)
+            {
+                _timer.Dispose();
+                _timer = null;
+            }
+        }
+    }
+}