ContactEdge: changed fields from private to public

body.GetContactList() was useless, because all fields in returned data are private. In original C++ they are implicitly public because ContactEdge is a struct.

src/box2dx/Box2D.NetStandard/Dynamics/Contacts/ContactEdge.cs

@@ -41,21 +41,21 @@ public class ContactEdge
         /// <summary>
         ///  The contact.
         /// </summary>
-        internal Contact contact;
+        public Contact contact;
 
         /// <summary>
         ///  The next contact edge in the body's contact list.
         /// </summary>
-        internal ContactEdge next;
+        public ContactEdge next;
 
         /// <summary>
         ///  Provides quick access to the other body attached.
         /// </summary>
-        internal Body other;
+        public Body other;
 
         /// <summary>
         ///  The previous contact edge in the body's contact list.
         /// </summary>
-        internal ContactEdge prev;
+        public ContactEdge prev;
     }
 }