Show header and footer system messages in email
* Add email_header_and_footer_enabled flag to appearances table * Set email_header_and_footer_enabled default value to false * Add checkbox to appearance to toggle show header and footer in emails * Add email_header_and_footer_enabled to allowed params in controller * Add header and footer messages to the html and text email layouts * Remove the color styling for emails header and footer * Add empty_mailer layout for emails without layout, to have the header and footer applied
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