Support for HTML5 audio/video preload

The attached patch adds support for the preload attribute to audio and video themes.

Updated patch: adds settings to the audio and video field formatters.

Thanks for the patch, I will be testing this one soon.

I have tested the patch from #3 which is working just fine.

switch back to the current status.

+++ b/file_entity.theme.inc
@@ -96,6 +96,12 @@ function theme_file_entity_file_audio($variables) {
+  if ($variables['preload']) {
+    $preload_value = drupal_strtolower($variables['preload']);
+    if (in_array($preload_value, array('none', 'auto', 'metadata'), FALSE)) {
+      $audio_attributes['preload'] = $preload_value;
+    }
+  }

Because the possible options are limited, I say let's remove this "validation" since it just adds extra effort when it's not necessary.

Simplified theme versions.

Patch which makes 'unspecified' the default option, as to not change existing implementations. I think this is fairly safe considering that mobile browsers do not pre-fetch by default if the attribute is not defined.

Committed #9 to 7.x-2.x.