Clarify ITN structured names for ferry routes by changing them to end in Ferry Route instead of Ferry

ITN ferry route features end in the descriptor Ferry, e.g. Brentwood Bay-Mill Bay Ferry. For clearer output the geocoder could change these to add the trailing word Route, e.g. Brentwood Bay-Mill Bay Ferry Route.

Perhaps some input accommodation would also have to be considered as a round-trip of the output would currently incur a 3pt garbage fault.

Start by tracing how ITN ferry route features are formatted in the geocoder and how those names are accepted during round-trip input. Done means ferry route output ends in “Ferry Route” and the round-trip no longer incurs the reported 3-point garbage fault.

Written by the indexing model from the issue text.