implement all BrowserWindow API Events and the rest of missed functions

ElectronNET.API/Entities/ThumbarButton.cs

@@ -0,0 +1,40 @@
+using Newtonsoft.Json;
+using System;
+
+namespace ElectronNET.API.Entities
+{
+    public class ThumbarButton
+    {
+        public string Id { get; internal set; }
+
+        [JsonIgnore]
+        public Action Click { get; set; }
+
+        /// <summary>
+        /// Control specific states and behaviors of the button. By default, it is ["enabled"].
+        /// 
+        /// enabled - The button is active and available to the user.
+        /// disabled - The button is disabled.It is present, but has a visual state indicating it will not respond to user action.
+        /// dismissonclick - When the button is clicked, the thumbnail window closes immediately.
+        /// nobackground - Do not draw a button border, use only the image.
+        /// hidden - The button is not shown to the user.
+        /// noninteractive - The button is enabled but not interactive; no pressed button state is drawn.This value is intended for instances where the button is used in a notification.
+        /// </summary>
+        public string[] Flags { get; set; }
+
+        /// <summary>
+        /// The icon showing in thumbnail toolbar.
+        /// </summary>
+        public string Icon { get; set; }
+
+        /// <summary>
+        /// The text of the button's tooltip.
+        /// </summary>
+        public string Tooltip { get; set; }
+
+        public ThumbarButton(string icon)
+        {
+            Icon = icon;
+        }
+    }
+}