Remove unused classes of the text template system

framework/src/Volo.Abp.TextTemplating/Volo/Abp/TextTemplating/TemplateContentContributorInitializationContext.cs

@@ -1,9 +0,0 @@
-using System;
-using JetBrains.Annotations;
-
-namespace Volo.Abp.TextTemplating
-{
-    public class TemplateContentContributorInitializationContext
-    {
-    }
-}

framework/src/Volo.Abp.TextTemplating/Volo/Abp/TextTemplating/TemplateContentContributorList.cs

@@ -1,9 +0,0 @@
-using System.Collections.Generic;
-
-namespace Volo.Abp.TextTemplating
-{
-    public class TemplateContentContributorList : List<ITemplateContentContributor>
-    {
-        
-    }
-}