Use the JSON data class pattern for User, Role, and PlayerStats and move
them into lib/src/data. This means that User is purely data now and
can't reference role objects directly. To make it possible easily check
permissions attached to roles and store data only visible on the
controller on user objects a ControllerUser type is introduced which is
linked with the UserManager and can therefore reference role objects
directly.
Resolves#525.
Add controller.autosave_interval config that specifies the frequency
which controller config, hosts, instances, users, mod packs and plugin
specific data which is held in memory should be automatically flushed to
disk if they have changed since the last time they were saved. This
prevents data loss in the event of a server crash.
Plugins can use the onSaveData hook to save its own data at the same
time as the controller does and this obsoletes making an autosave
interval in the plugin.
Resolves#523.
Be consistent with the usage of tabs as indents in all JSON files in the
project. This makes it easier to configure editors to emit the right
indents when manually editing these files.
Remove extra whitespace, use more consistent spacing, add missing
semicolons, using dangling commas, break up long lines, consistent
multiline operator placement, add missing JSDoc strings and so on.