modified ITheme interface (#344)

* upgrade to .NET Core 3.2 Preview 3 and fixes for issues created by #314

* Components based on Bootstrap4 for Sections and  TabStrip to increase productivity and promote uniformity in Module UIs

* rolled back change creating an Infrastructure.Interfaces namespace, modified IModule interface to be strongly typed

* modified ITheme interface

Oqtane.Client/Themes/BlazorTheme/ThemeInfo.cs

@@ -0,0 +1,14 @@
+using Oqtane.Models;
+
+namespace Oqtane.Themes.BlazorTheme
+{
+    public class ThemeInfo : ITheme
+    {
+        public Theme Theme => new Theme
+        {
+            Name = "Blazor Theme",
+            Version = "1.0.0"
+        };
+
+    }
+}