Cleanup the editor assembly and provide a tool overview doc

Assets/Editor/CustomEditorsAndDrawers/LayerPropertyDrawer.cs

@@ -0,0 +1,54 @@
+using UnityEngine;
+using UnityEditor;
+
+namespace AppleHills.Core.Settings.Editor
+{
+    /// <summary>
+    /// Custom property drawer for layer fields to display a dropdown with layer names
+    /// </summary>
+    [CustomPropertyDrawer(typeof(LayerAttribute))]
+    public class LayerPropertyDrawer : PropertyDrawer
+    {
+        public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
+        {
+            EditorGUI.BeginProperty(position, label, property);
+            
+            // Draw a nice layer selection dropdown like the one in Unity inspector
+            if (property.propertyType == SerializedPropertyType.Integer)
+            {
+                property.intValue = EditorGUI.LayerField(position, label, property.intValue);
+            }
+            else
+            {
+                EditorGUI.LabelField(position, label.text, "Use [Layer] with int fields only");
+            }
+            
+            EditorGUI.EndProperty();
+        }
+    }
+    
+    /// <summary>
+    /// Custom property drawer for LayerMask fields to display a mask dropdown with layer names
+    /// </summary>
+    [CustomPropertyDrawer(typeof(LayerMaskAttribute))]
+    public class LayerMaskPropertyDrawer : PropertyDrawer
+    {
+        public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
+        {
+            EditorGUI.BeginProperty(position, label, property);
+            
+            // Draw a nice layer mask selection like the one in Unity inspector
+            if (property.propertyType == SerializedPropertyType.LayerMask)
+            {
+                property.intValue = EditorGUI.MaskField(position, label, 
+                    property.intValue, UnityEditorInternal.InternalEditorUtility.layers);
+            }
+            else
+            {
+                EditorGUI.LabelField(position, label.text, "Use [LayerMask] with LayerMask fields only");
+            }
+            
+            EditorGUI.EndProperty();
+        }
+    }
+}