cleanup. refactored program.cs to make use of static setup classes

server/Models/CharacterFilter.cs

@@ -1,10 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace server.Models
+namespace server.Models
 {
     public class CharacterFilter
     {