Denote mid range in comments
Remove now obsolete Rotterdam and rename Rotterdam raw ~> Rotterdam

Because we work with meter coordinates there is no post processing anymore, and the simulator can produce layouts that can be pasted directly in Config.ts.
Add id to AntennaLayout
Scale 'Rotterdam oud' so coordinates are correct

The resulting coordinates are now the same as the coordinates this layout had before changing the scaling/refactoring method.
Background image needs to be optional after all for Groningen layouts
Update old Groningen layouts to new scale/translate method