don't say "content" when we mean "contents"

The variables inside templates are often called $content when what we actually meant was the contents of the template. I propose that we change the variable name form "content" (which in the drupal world seems to mean node) to "contents" which should indicate "the stuff in this template" and confuse people less.

Before:

<div id="<?php print $block_html_id; ?>" class="<?php print $classes; ?>"<?php print $attributes; ?>>

  <?php print render($title_prefix); ?>
<?php if ($block->subject): ?>
  <h2<?php print $title_attributes; ?>><?php print $block->subject ?></h2>
<?php endif;?>
  <?php print render($title_suffix); ?>

  <div<?php print $content_attributes; ?>>
    <?php print $content ?>
  </div>
</div>

After:

<div id="<?php print $block_html_id; ?>" class="<?php print $classes; ?>"<?php print $attributes; ?>>

  <?php print render($title_prefix); ?>
<?php if ($block->subject): ?>
  <h2<?php print $title_attributes; ?>><?php print $block->subject ?></h2>
<?php endif;?>
  <?php print render($title_suffix); ?>

  <div<?php print $contents_attributes; ?>>
    <?php print $contents ?>
  </div>
</div>