Core class used for handling automatic background updates.

If we tried to perform a core update, check if we should send an email, and if we need to avoid processing future updates.

If we tried to perform plugin or theme updates, check if we should send an email.

Determines whether the entire automatic updater is disabled.

Checks for version control checkouts.

Kicks off the background update process, looping through all pending updates.

Notifies an administrator of a core update.

Prepares and sends an email of a full log of background update results, useful for debugging and geekery.

Sends an email upon the completion or failure of a background core update.

Sends an email upon the completion or failure of a plugin or theme background update.