Added support for migrating existing Oqtane installations from DbUp to Migrations. Also added a Migration for version 2.0.2, and set current version to 2.1.0

Oqtane.Server/Migrations/02000201_AddSiteGuidToSite.cs

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+using System.Collections.Generic;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Oqtane.Interfaces;
+using Oqtane.Migrations.EntityBuilders;
+using Oqtane.Repository;
+
+namespace Oqtane.Migrations
+{
+    [DbContext(typeof(TenantDBContext))]
+    [Migration("Tenant.02.00.02.01")]
+
+    public class AddSiteGuidToSite : MultiDatabaseMigration
+    {
+        public AddSiteGuidToSite(IEnumerable<IOqtaneDatabase> databases) : base(databases)
+        {
+        }
+
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            //Add Column to Site table
+            var siteEntityBuilder = new SiteEntityBuilder(migrationBuilder, ActiveDatabase);
+            siteEntityBuilder.AddStringColumn("SiteGuid", 36, true, false);
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            //Drop Column from Site table
+            var siteEntityBuilder = new SiteEntityBuilder(migrationBuilder, ActiveDatabase);
+            siteEntityBuilder.DropColumn("SiteGuid");
+        }
+
+    }
+}