Template for outputting the dynamic block styling within a Layout.
This template outputs the same content as the layout-block.tpl.php template,
but uses a dynamic value for all its HTML tags. This allows site-builders to
customize every aspect of the block markup through the user interface. If
you need to customize the output of a block in the theme layer, it may be
easier to configure the block to use the default style, and override the
simpler block.tpl.php file instead.
$wrapper_tag: The HTML tag to be used around the entire block.
$classes: Array of classes that should be displayed on the block's wrapper.
$attributes: Attributes that should be displayed on this block's wrapper.
$title: The title of the block.
$title_prefix/$title_suffix: A prefix and suffix for the title tag. This
is important to print out as administrative links to edit this block are
printed in these variables.
$title_tag: The HTML tag to be used on the title of the block.
$content_tag: The HTML tag to be used around the content.
$content_attributes: Attributes that should be displayed on the content.