* removed iconForModel from interface and aircraft config parser
* CPixmap support for loading pixmap from file
* Access to model of model set loader by model string
* icon path as member of CAircraftModel
* seed for random numbers per thread
* added function to get all user metatypes as string
* added new read file function per path/name
* removed DBus operators for pixmap
* JSON operators for byte array
* util function for JSON string