Make updates easier - Built-in auto-updates

[pH-7]

Let's have an "automatic update" feature available to every pH7Builder webapp's owner to update the software without hassles. When a new update will be released, a button as well as a notification alert visible in the admin panel (and maybe an email notification too..) will show up.

A button saying "Update to the latest version (v18.X.X)" for processing the update of the system will be available in a new update page of the admin panel.

[pH-7]

An update system built into pH7Builder CMS. Users will be able to go into an admin menu and simply click to update the system.

• If there is an update found on the server (like GitHub),
  • it would be downloaded to the client's server.
  • Then it would uncompress the file and a file comparison would begin, checking to see what files needed to be changed.
  • Then, the site would be put into maintenance mode,
    • Then, files would get changed (and composer dependencies would be handled too).
    • Then, the site taken out of maintenance mode,
    • Then, reloaded the site.
    • After all of this, the automatic updater would then remove the compressed file and any files that were created by the update process that are no longer needed.