This introduces the idea of a `Neo4jPersistentPropertyConverter`, a `Neo4jPersistentPropertyConverterFactory` and an annotation `@ConvertWith`.
The annotation can be applied to fields and other annotations.
It is used to indicate that a given `Neo4jPersistentProperty` needs a custom conversion for reads and writes and overwrides all existing converters.
The annotation allows to specifiy the converter through `converter()` and an optional factory.
The default `Neo4jPersistentPropertyConverterFactory` will just try to instantiate the given converter class.
More sophisticated solutions need dedicated factories.
To make the factories work possible, the whole persistent property is passed as a construction parameter, so that the `@ConvertWith` annotation
or any other meta-annotated annotations can be retrieved.
In the progress of implementing this, the `Neo4jEntityConverter` has been stripped of its duties to convert single values.
Instead, a `Neo4jConversionService` has been introduced that orchestrates the underlying spring service and possible overrides.
The conversion will applied at all places where a persistent property can be deduced, either from the model or from parameters targeting the properties.
It will not be applied to parameters of string based queries or SpEL.
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