* Fixes#4656.
* Adds an atcommand option for reloading the attendance database.
* Adds missing headers for attendance database.
* Adds missing reload options in the atcommand configuration.
Thanks to @lelouch22's suggestion!
Synchronized the process of loading and parsing YAML databases.
Provides more robust parse warnings/errors.
Added Header checks to validate database versions.
Adjusted root keys to a standard name of Body.
Adjusted inter-server storages, achievements, and attendance to follow the new format.
Fixes#3483
Thanks to @Lemongrass3110!