Add status interface

[MandusBorjesson]

The status interface should allow clients to report issues that they experience with the current configuration. The setting handler should not act on the information, only store it so that other clients can fetch it. Suggested interface methods:

Method ReportIssue a{sis} -> None
s - parameter name
i - issue code
s - issue description

Method Issues -> a{sis}
s - parameter name
i - issue code
s - issue description