Enhancements

• get_object_property_value() now has the ability to get the value for protected or private properties.
• object_has_property() can now detect the existence of non-{public|protected|private} dynamically assigned properties on any object.
• \VersatileCollections\CollectionInterface::sortByMultipleFields() and
  \VersatileCollections\CollectionInterface::sortMeByMultipleFields() now
  work with any type of object (not just only those that implement ArrayAccess)
• \VersatileCollections\CollectionInterface::column() can now extract values
  from private and / or protected fields in each object in a collection.