* Update focalboard to be compatible with mattermost v6
* Point to the new plugin API version
* Fix collectors linter issues
* Move all CI jobs to 1.16
- structured, asynchronous logging
- supports discreet log levels, including custom levels
- supports output to console, files, and all common log aggregators.
- supports JSON, plain text and GELF formats
- lazy formatting and writing
* Improving mattermost auth implementation
* Making mattermost-auth based on shared database access
* Reverting unneeded changes in the config.json file
* Fixing tiny problems
* Removing the need of using the mattermost session token
* Fixing some bugs and allowing to not-bind the server to any port
* Small fix to correctly get the templates
* Adding the mattermost-plugin code inside focalboard repo
* Adding a not working code part of the cluster websocket communication
* Updating the mattermost version
* Adding the cluster messages for the websockets
* Updating to the new node version
* Making it compatible with S3
* Addressing some tiny problems
* Fixing server tests
* Adds support for MySQL migrations and initialization
Co-authored-by: Miguel de la Cruz <miguel@mcrx.me>
