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This removes duplicate code (ical, ERA SSB), enables more fields to filter
on (PkPass) and/or adds filtering to types that previously didn't support
this yet (UIC 918.3, VDV).

This is prone to timezone-related "rounding errors", instead rely on the
post-processor to merge departure day and departure time values correctly.

The problem here is that the way we extracted the date from a JS Date
object was prone to timezone conversion rounding errors, possibly giving
us a day before or after as well. We fix this by letting the post-processor
deal with the problem for us.

This makes post-processing handle the case that the departure time only
contains a time by using the departure day value to fill the gap.

This avoids extractor scripts having to do error prone date/time
computations in JS, in particular if both values are extracted from
different document nodes (e.g. a barcode and a PDF body).

Superseded by the more generic contextDateTime property of the document
node object.

This means we can now also produce meaningful data if we only have a VR
barcode without the surrounding PDF, e.g. when scanning tickets bought
at vending machines. We also get a few more details (class, reservation
number) for free.

This is needed to phase out the global Context object, which is what we
use so far to convey information about the triggering data.

This is (mostly) what Trenitalia is using, although in the second half
this isn't matching their content it seems. Even if that turns out to not
be a bug in our code this is already worth it, as this manages to properly
decode international destination codes, unlike our previous code.

That's what VR is using. Still needs support for decoding long numeric
properties.

Version 1 and 2 seem to be in active use as well, besides the version 3
we already support.

This is now easily possible since ERA SSB objects are already present in
the extractor document tree.

Needed to generate correct barcodes out of this again.

(cherry picked from commit 8cca4440)

(cherry picked from commit a84c145b)