Switch to db-vendo-client

[traines-source]

Pending discussion in #60, just the simple switch to the db-vendo-client backend, without any documentation changes yet.

I have verified that caching* and the basic API works as expected – and I've been using hafas-rest-client together with db-vendo-client for multiple weeks now, so that part should be fine. (I have smuggled in backwards-compatible support for multiple travellers, since db-vendo-client supports that now).

EDIT: Caching never worked even for quickly repeated requests of e.g. boards without a when param and the same (default) duration, since it would assume that within these few seconds, a new departure/arrival could be inside the window.

Before releasing/deploying a new version of db-rest, it may also be useful to discuss these PR's in upstream projects:
public-transport/hafas-rest-api#15
derhuerst/db-hafas-stations#3

[socket-security]

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Package	New capabilities	Transitives	Size	Publisher
npm/[email protected]	environment, network Transitive: eval, filesystem	+36	128 MB	traines-source

🚮 Removed packages: npm/[email protected]

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