Better Route Search Remark

[LOOHP]

Changes the "route remark" underneath each route in the search screen from the first stop to the difference between itself and the main line.

Continuation of #142.

[thomas930]

It's great if screenshot can be shown.

[chunlaw]

Some routes are now missing the origin, would it be better to add them back?

[LOOHP]

The idea of this change is to only display differences between special routes with their main routes. Since the main route doesn't have any differences with itself, there is no remark.
It could be changed to fallback to displaying the origin if there are no remarks if it is decided that that is better.

[chunlaw]

The idea of this change is to only display differences between special routes with their main routes. Since the main route doesn't have any differences with itself, there is no remark. It could be changed to fallback to displaying the origin if there are no remarks if it is decided that that is better.

Might you please apply the fallback?