use List instead of IList, remove "List" from method names. remove unnecessary using statements

Oqtane.Shared/Models/SearchResults.cs

@@ -4,7 +4,7 @@ namespace Oqtane.Models
 {
     public class SearchResults
     {
-        public IList<SearchResult> Results { get; set; }
+        public List<SearchResult> Results { get; set; }
 
         public int TotalResults { get; set; }
     }