Fix of issue with the build

+The optional property drawer class used in Editor is not available in build, but was still included in compilation which resulted in build error

Author: SitronX

Assets/TimeRewinder/TimeRewinderImplementation/Scripts/Utils/OptionalPropertyDrawer.cs

@@ -1,3 +1,4 @@
+#if UNITY_EDITOR
 using UnityEditor;
 using UnityEngine;
 
@@ -37,4 +38,5 @@ GUIContent label
             EditorGUI.EndProperty();
         }
     }
-}
+}
+#endif