* removed workaround in web data services
* removed convertFromDatabaseJson functions, not needed
* changed to use the correct static fromDatabaseJson functions
* fixed prefixes
* load correct Country object by loading it as nested object
* key and timestamp was missing in CAirport tuple metadata
* common base class for DB based classes
* common base class for DB based containers
* Livery, distributor value class
* adjusted value classes to livery
* utility functions for DB values (blackmisc free functions)
* register new objects with metadata system