Framework changed to WPF

Only the basic window frame is implemented.
Adjusted the structure of resource files.

Source/GrasscutterTools/Models/GameItem.cs

@@ -0,0 +1,16 @@
+namespace GrasscutterTools.Models
+{
+    public class GameItem
+    {
+        public int Id { get; set; }
+
+        public string Name { get; set; }
+
+        public string Category { get; set; }
+
+        public override string ToString()
+        {
+            return $"{Id} : {Name}";
+        }
+    }
+}

Source/GrasscutterTools/Models/GameItems.cs

@@ -0,0 +1,35 @@
+using System;
+using System.Collections.ObjectModel;
+
+namespace GrasscutterTools.Models
+{
+    public class GameItems : Collection<GameItem>
+    {
+        public GameItems(string sources)
+        {
+            var lines = sources.Split(new char[] { '\n', '\r' }, StringSplitOptions.RemoveEmptyEntries);
+            var category = string.Empty;
+            foreach (var line in lines)
+            {
+                if (line.StartsWith("//"))
+                {
+                    category = line.Substring(2).Trim().Replace('_', ' ').ToLowerInvariant();
+                    category = char.ToUpperInvariant(category[0]) + category.Substring(1);
+                }
+                else
+                {
+                    var sp = line.IndexOf(':');
+                    if (sp >= 0)
+                    {
+                        Items.Add(new GameItem
+                        {
+                            Id = int.Parse(line.Substring(0, sp).Trim()),
+                            Name = line.Substring(sp + 1).Trim(),
+                            Category = category
+                        });
+                    }
+                }
+            }
+        }
+    }
+}