Performance improvements, refactoring of multi-tenant support, split Alias and Tenant entities for cleaner separation of concerns, create an additional site during installation for demonstratng multitenancy

Oqtane.Client/Services/IAliasService.cs

@@ -0,0 +1,19 @@
+using Oqtane.Models;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+namespace Oqtane.Services
+{
+    public interface IAliasService
+    {
+        Task<List<Alias>> GetAliasesAsync();
+
+        Task<Alias> GetAliasAsync(int AliasId);
+
+        Task AddAliasAsync(Alias alias);
+
+        Task UpdateAliasAsync(Alias alias);
+
+        Task DeleteAliasAsync(int AliasId);
+    }
+}