Cleanup and fixes

I made the following improvements for a project I've worked on so here they are:

• Fixes:
  • Code cleanup to meet Drupal coding standards (mostly indentation).
  • Converted width and height elements to varchar so other units than pixels can be specified. Defaults to pixels through HTML attributes.
  • Allowed default values to be set for all field elements even when the ID is empty.
  • Escaped all iframe URL parameters and attributes through check_plain to avoid code injection.
  • Fixes on field names and descriptions to make everything more clear.
• Improvements:
  • Automatic i18n support (as supported by the Wikiloc site). Fallback to English for Wikiloc unsupported languages.
  • Added validation to check that ID element is numeric.
  • Moved module into Fields package.

You have to run update.php after applying the patch.