Change NodeIntegration Default to False

This should be the default as it is more secure. It is trivial for applications which wish to take on the additional attack surface to set "            browserWindowOptions.WebPreferences.NodeIntegration = false;"

Author: gfs

ElectronNET.API/Entities/WebPreferences.cs

@@ -15,10 +15,10 @@ public class WebPreferences
         public bool DevTools { get; set; } = true;
 
         /// <summary>
-        /// Whether node integration is enabled. Default is true.
+        /// Whether node integration is enabled. Default is false.
         /// </summary>
-        [DefaultValue(true)]
-        public bool NodeIntegration { get; set; } = true;
+        [DefaultValue(false)]
+        public bool NodeIntegration { get; set; } = false;
 
         /// <summary>
         /// Whether node integration is enabled in web workers. Default is false.