Added a new option for a ConfigParameterDescription to add the file
extensions information. The class is currently growing, but I don't want
to change everything just for a file extension.

Change-Id: I1abfff0b430d3bbddb8a728f83f37eea818c128f
Signed-off-by: Peter Merkert <p.merkert@sap.com>
Added a default file name field. It is used to give a user a default
file name when selecting a file on the hard disk with a dialog.

Change-Id: Ibd65d0b69258da11095fd9c5421399baaf4cabf0
Signed-off-by: Peter Merkert <p.merkert@sap.com>