Replace current configuration mess with a trimmed down version of the
original vision of #200. Configs are collection of config groups that
have fields that can be set. These groups allow organizing the fields
as well as opertunity for plugins to add their own groups. By default
plugins have an auto generated group with the enabled field.
Move item database, tests, endpoint definitions for /api/place,
/api/remove, /api/inventory, /api/inventoryAsObject, and the web
interface view for the storage page into the clusterioMod plugin.
Hornwitser