Validator should flag ferry routes which are not connected to a highway=* or man_made=pier

[GerdP]

Sometimes ways with route=ferry are not properly connected to a highway. This can cause routing problems.
I know these typical problem cases:
1) the route is split into parts, so that an end node is only connected with other route=ferry ways
2) the connected highway is mapped with a low class, e.g. as hw=service instead of e.g. hw=secondary

I've attached a sample file created from current OSM data in Canada which contains both problems.
Nodes 660826272 and 323308217 are samples for 1), Node 1682319513 is a sample for 2)
If this check requires Java code please let me know and I'll try to code it.

I am not sure how to handle ferry routes which allow vehicles (e.g. bicycle or mofa) if they end at
a man_made=pier (and no other highway).