Major refactor.

Core now formed and contains all useful utility to create custom ui with restrictions.
Many methods was extracted from different classes and moved to core.

Undo is now supported(because unity's undo bug seems to be fixed).

Example now moved into same level separate folder.

Assets/Textus/SerializeReferenceUIExample/ExampleAnimalWorldAssembly/AmimalWorld.asmdef

@@ -0,0 +1,3 @@
+{
+	"name": "AmimalWorld"
+}

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Assets/Textus/SerializeReferenceUIExample/ExampleAnimalWorldAssembly/Animals/AnimalBase.cs

@@ -0,0 +1,42 @@
+using System;
+using UnityEngine;
+
+[Serializable]
+public class AnimalBase : IAnimal
+{
+    [SerializeField] protected float age;
+    public GameObject food;
+    public virtual void Feed()
+    {
+        Debug.Log("Thanks");
+    } 
+}
+  
+[Serializable]
+public class AnimalChild : AnimalBase {} 
+
+[Serializable]
+public abstract class AnimalGrandChildAbstract : AnimalBase
+{
+    public string someString;
+}
+
+[Serializable]
+public class AbstractAnimalGrandChild : AnimalGrandChildAbstract {}
+
+
+[Serializable]
+public abstract class AbstractAnimal : IAnimal
+{
+    [SerializeField] protected float age;
+    public GameObject food;
+    public virtual void Feed()
+    {
+        Debug.Log("Thanks");
+    } 
+}
+
+[Serializable]
+public class AbstractAnimalChild : AbstractAnimal {}
+
+

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Assets/Textus/SerializeReferenceUIExample/ExampleAnimalWorldAssembly/Animals/IAnimal.cs

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+public  interface IAnimal
+{
+    void Feed();
+}

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Assets/Textus/SerializeReferenceUIExample/ExampleAnimalWorldAssembly/Animals/MammalBase.cs

@@ -0,0 +1,7 @@
+using System;
+ 
+[Serializable]
+public abstract class MammalBase : AnimalBase
+{  
+    public int numberOfBones;
+}  

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