Complete email summary sending system
Added the necessary classes to send email summaries. First, added a script to run on a daily basis. Second, added a queue handler for sending email summaries for users, and another to queue summaries for all users on the site. Fixed up the email_summary_status table to store the last-sent notice id, rather than a datetime (since we don't support 'since' parameters anymore). Finally, made the plugin class load the right modules when needed.
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