Simplified implementation of ObjectPath to use a static root instance and hand the path further down until final resolution in MappingMongoConverter.readValue(…). This removes a bit of boxing and unboxing code both in ObjectPath and the converter.
Introduced ObjectPath.getPathItem(…) to internalize the iteration to find a potentially already resolved object.
Renamed parameters and fields of type ObjectPath to path consistently. Removed obsolete method in MappingMongoConverter.
Original pull request: #209.
bf85d8facd