Rework the error handling in EAC dialog
In the current situation there are fragments of the ErrorStep class which were used earlier to display the errors and there is the export of the error and exceptions to handle them in the TCTokenHandler class.
The first variant was disabled because of missing gui capabilities (There is no possibility to change the button text to finish or something like that. In an error case there is always Next and Abort.)
A code cleanup should be done.