Computed values

Pushed an update to the test in the branch which will fail because all the computed values are loaded from the db as NULL.

It uses a reflection class to get the field values from the entity as they came from the EntityLoad without doing any field loading.

    // Before accessing the entity field and incidentally trigger a calculation.
    $relection = new \ReflectionClass($entity);
    $property = $relection->getProperty('values');
    $property->setAccessible(TRUE);
    // Retrieve the values as they came from storage.
    $values = $property->getValue($entity);

The first test added passes as the $entity->geofield_field->value does set a wkt value to the value property and this is stored.

    // Check stored set value.
    $this->assertEquals($value, $values['geofield_field']['x-default'][0]['value']);

But the following tests all fail because while the property values have been loaded from the database, they are all NULL.

    // Check stored computed values.
    $geom = \Drupal::service('geofield.geophp')->load($value);
    $centroid = $geom->getCentroid();
    $bounding = $geom->getBBox();
    $computed = [];

    $computed['geo_type'] = $geom->geometryType();
    $computed['lon'] = $centroid->getX();
    $computed['lat'] = $centroid->getY();
    $computed['left'] = $bounding['minx'];
    $computed['top'] = $bounding['maxy'];
    $computed['right'] = $bounding['maxx'];
    $computed['bottom'] = $bounding['miny'];
    $computed['geohash'] = $geom->out('geohash');

    foreach ($computed as $index => $computed_value) {
      $this->assertEquals($computed_value, $values['geofield_field']['x-default'][0][$index]);
    }