Added errorhandling to generating Fml->Jas name mappings.
Conflicting mappigns will not be added, but are documented with either A or B depending on if it occurs during reading config or generating entries not in the config.
A: 'Duplicate entity class detected. Ignoring FML,JasName pair [{FmlName},{JasName}] for class, class {JavaClass}' or
B: 'Duplicate entity mapping generating new entities. Entity-FML mapping Mapping [{JasName}] already exists. Iggnoring: [FMLname:class]=[{FmlName}:{javaClass}]'