* Download and verify Nextcloud download before deleting old install directory
* Changed install logic to look at config.php and not version.php for database version number. When restoring from a backup, config.php in STORAGE_ROOT will hold the Nextcloud version that corresponds to the user's database and version.php in /usr/local won't even exist, so we were missing Nextcloud migration steps. In other cases they should be the same.
* Update to Nextcloud 15.0.7, Contacts to 3.1.1, and Calendar to 1.6.5
* Enabled localhost-only insecure IMAP login for localhost Nextcloud auth
* Add package php-imagick and BigInt conversion
* added support for /cloud/oc[sm]-provider/ endpoint