Add data to view

ModelMappers were created with every single View.convert call. Sadly,
creating a ModelMapper with a bunch of IdMappers is extremely expensive.
This process is mitigated by forcing the user of Librador to implement
LibradorConfigAdapter, which configures the IdMapperBuilder and exposes
a ModelMapper as a bean.

This View data is filled in to represent the original object but should
never be represented as a property. The postApply method is now by
default applied to make sure all child view fields also get postApplied.