feat: adding custom drawer for networkprefab field

will draw create new and field referecne in 1 line if it doesn't exist

Assets/Mirage/Editor/NetworkPrefabsPropertyDrawer.cs

@@ -0,0 +1,71 @@
+using Mirage.EditorScripts.Logging;
+using UnityEditor;
+using UnityEngine;
+
+namespace Mirage
+{
+    [CustomPropertyDrawer(typeof(NetworkPrefabs))]
+    public class NetworkPrefabsPropertyDrawer : PropertyDrawer
+    {
+        private const float REF_WIDTH = 0.3f;
+        private const float LABEL_WIDTH = 0.4f;
+        private const float BUTTON_WIDTH = 0.3f;
+
+        public override void OnGUI(Rect rect, SerializedProperty property, GUIContent label)
+        {
+            if (property.objectReferenceValue == null)
+            {
+                noValueGUI(rect, property, label);
+            }
+            else
+            {
+                EditorGUI.PropertyField(rect, property, label);
+                //valueGUI(rect, property, label);
+            }
+        }
+
+        private void noValueGUI(Rect rect, SerializedProperty property, GUIContent label)
+        {
+            var x = rect.x;
+            var refWidth = rect.width * REF_WIDTH;
+            var labelWidth = rect.width * LABEL_WIDTH;
+            var buttonWidth = rect.width * BUTTON_WIDTH;
+
+            EditorGUI.LabelField(new Rect(x, rect.y, labelWidth, rect.height), label);
+            x += labelWidth;
+
+            var createNew = GUI.Button(new Rect(x, rect.y, buttonWidth, rect.height), "Create New");
+            x += buttonWidth;
+
+            if (createNew)
+            {
+                createNewValue(property);
+            }
+
+            EditorGUI.BeginChangeCheck();
+            EditorGUI.PropertyField(new Rect(x, rect.y, refWidth, rect.height), property, GUIContent.none, false);
+            if (EditorGUI.EndChangeCheck())
+            {
+                property.serializedObject.ApplyModifiedProperties();
+            }
+        }
+
+        private void createNewValue(SerializedProperty property)
+        {
+            // name of gameobject that this property is on
+            var gameObjectName = property.serializedObject.targetObject.name;
+
+            var value = ScriptableObjectUtility.CreateAsset<NetworkPrefabs>(gameObjectName + "_NetworkPrefabs", "Assets");
+
+            property.objectReferenceValue = value;
+            property.serializedObject.ApplyModifiedProperties();
+        }
+
+        protected virtual void valueGUI(Rect rect, SerializedProperty property, GUIContent label)
+        {
+            // todo draw internal list here
+            //drawCanEditVar(pos, property, label);
+            //drawPropertyField(refWidth, refRect, property, GUIContent.none);
+        }
+    }
+}