Default view template to display a rows in a grid.
$classes: An array of classes to apply to the grid, based on settings.
$attributes: An array of additional HTML attributes for the grid.
$caption: The caption for this grid. May be empty.
$rows: A nested array of rows. Each row contains an array of columns.
$column_classes: An array of classes to apply to each column, indexed by row number, then column number. This matches the index in $rows.
* Default view template to display a rows in a grid.
* - $classes: An array of classes to apply to the grid, based on settings.
* - $attributes: An array of additional HTML attributes for the grid.
* - $caption: The caption for this grid. May be empty.
* - $rows: A nested array of rows. Each row contains an array of columns.
*   row number, then column number. This matches the index in $rows.