Changed structure of information handling:

From now on, it is necessary to implement an info plugin for each specific data type. This plugin has to override InformationInterface in order to provide information on a clicked object.

git-svn-id: http://www.openflipper.org/svnrepo/OpenFlipper/branches/Free@11425 383ad7c9-94d9-4d36-a494-682f7c89f535