Refactor TypeConverter API
Currently TypeConverters support multiple source but only one target type.
As discussed with Robert, this should be changed so that you can specify an array of supported TargetTypes.
This makes especially sense when using TypeConverters independently from the PropertyMapper.
The TypeConverterInterface should be adjusted like:
Sebastian Kurfuerst I'm assigning this to you, because that should be changed before the backport of the PropertyMapper. Feel free to unasign yourself if you can't to it atm ;)