* Prepare file upload infrastructure for Data Retention.
This commit prepares the file upload infrastructure for the data
retention feature that is under construction. Changes are:
* Move file management code to utils to allow access to it from jobs.
* From now on, store all file uploads in a top level folder which is the
date of the day on which they were uploaded.
This commit is based on Harrison Healey's branch, but updated to work
with the latest master.
* Use NewAppError
* Revert "PLT-5765 Passed SiteURL to SendNotifications (#5705)"
This reverts commit a8e68bd890.
* Removed automatic configuration of SiteURL
* Reverted unintentional config changes
* Updated help text
* Added link to docs in Site URL warning
* Fixed merge conflict
* Added separate post types for system_join_leave and system_add_remove posts
* Added username prop to channel deleted posts
* Changed slack import to properly generate the new join/leave messages
* Added username prop to channel update posts
* Moved Post(AddTo/RemoveFrom)ChanneMessage into app package
This commit provides the first part of the bulk import system.
The CLI command is provided, complete with validation & apply modes. All
the basic properties of Teams and Channels can be imported. Users &
Posts will follow separately in a future commit.
This fixes the issue where the channel fails to Import from Slack if
there is already a channel with the same name on Mattermost that has
been deleted.
