Create configuration for a reference value mapping

[sWalbrun]

As an admin, I want to configure for every topic a mapping between the shareType and the corresponding reference value. The count of shares should furthermore exist. E.g.
Share::value = ONE (static in configuration, individual per user)
`Topic::referenceValues => [
'kleine Kiste' => 68€,
'große Kiste' => 80€
] (dynamic in configuration, individual per user)

As soon as the extended import is available, the keys of the referenceValues should be importable for each user. The import should throw an exception in case a non found key has been found.