Added support for per site options and OpenID Connect

Oqtane.Server/Infrastructure/Options/SiteOptions.cs

@@ -0,0 +1,22 @@
+using System;
+using Oqtane.Models;
+
+namespace Oqtane.Infrastructure
+{
+    public class SiteOptions<TOptions, TAlias> : ISiteOptions<TOptions, TAlias>
+        where TOptions : class, new()
+        where TAlias : class, IAlias, new()
+    {
+        private readonly Action<TOptions, TAlias> configureOptions;
+
+        public SiteOptions(Action<TOptions, TAlias> configureOptions)
+        {
+            this.configureOptions = configureOptions;
+        }
+
+        public void Configure(TOptions options, TAlias siteOptions)
+        {
+            configureOptions(options, siteOptions);
+        }
+    }
+}