Changed design of monitors for better extensibility

MtApi/Monitors/Triggers/TimeElapsedTrigger.cs

@@ -0,0 +1,40 @@
+using System;
+using System.Timers;
+
+namespace MtApi.Monitors.Triggers
+{
+    public class TimeElapsedTrigger : IMonitorTrigger
+    {
+        readonly Timer _timer;
+
+        public event EventHandler Raised;
+        /// <summary>
+        /// Interval for raising the trigger
+        /// </summary>
+        public TimeSpan Interval
+        {
+            get => TimeSpan.FromMilliseconds(_timer.Interval);
+            set => _timer.Interval = value.TotalMilliseconds;
+        }
+        public bool IsStarted => _timer.Enabled;
+
+        public bool AutoReset { get => _timer.AutoReset; set => _timer.AutoReset = value; }
+
+        public TimeElapsedTrigger(TimeSpan time, bool autoReset = true)
+        {
+            _timer = new Timer(time.TotalMilliseconds);
+            _timer.Elapsed += _timer_Elapsed;
+            AutoReset = autoReset;
+        }
+
+        private void _timer_Elapsed(object sender, ElapsedEventArgs e)
+        {
+            _timer.Elapsed -= _timer_Elapsed;
+            Raised?.Invoke(this, EventArgs.Empty);
+            _timer.Elapsed += _timer_Elapsed;
+        }
+        public void Stop() => _timer.Stop();
+
+        public void Start() => _timer.Start();
+    }
+}