Added Separate settings to key setting type of Multi format

Magic 3.1.0

In the previous versions, because only one type of key per format ID was allowed to be specified in a Multi Format format, multiple types of keys per format ID could not be used for search in the format.

In DataMagic Ver.3.1.0, up to three types of keys per format ID can be specified in an entry of Multi Format settings. As a result, multiple types of key per format ID can now be used for search in a Multi Format format.