Support for third party modules, improved error handling, standardardized enum naming, reorganized interface definitions, support for DB script upgrades, added Settings entity

Oqtane.Client/Services/Interfaces/IInstallationService.cs

@@ -0,0 +1,12 @@
+using Oqtane.Models;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+namespace Oqtane.Services
+{
+    public interface IInstallationService
+    {
+        Task<GenericResponse> IsInstalled();
+        Task<GenericResponse> Install(string connectionstring);
+    }
+}