Added:
 - StringExtensions (replace all)
 - Started with ContactList, didn't find it necessary, discarded for now
 - Started with LineUp, got stuck, discarded for now
 - Started with TicketOrders, good as finished

Changed:
 - Generally:
    -> added .Trim() to strings fetched from database
    -> added Add, Edit and Delete functions
 - DoubleToPriceConverter (convert back now supports entering comma seperated instead of dot and ignores euro sign)
 - Design template
 - Images