[DX] Sanitization cleanup

[jenlampton]

In several places an object has its parts sanitized and is then passed to the theme layer. This creates a confusing and possibly dangerous scenario where we are training front-end developers that it's okay to print directly from these objects. It would be better to create an array of data values for use in the theme, where one of those values can be the full, unsanitized object.

For example, a vocabulary could look like this:

$vocabulary = ...
$vocab_info = array(
  'name' => check_plain($vocabulary->name),
  'description' => check_plain($vocabulary->description),
  'original => $vocabulary,
);