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This now all uses the new decoding utilities that do proper boundary
checks, and reduces the amount of duplicated magic numbers. This also
found two issues in the existing boundary checks, and a wrong deciding
of the RCT2 field format flag.

Otherwise it fails to build because the assignment operator for char is deleted

This adds support for version 2 according to ERA TAP TSI TD B.12 with its
enlarged signature field.

This also factors out the low-level decoding utility functions as we need
them independent of the Uic9183Block structure.

Those contain a more reliable validity time range for return tickets,
compared to all other date/time sources in here.

Those contain local public transport extensions for DB long distance
tickets, using elements of the VDV ticket format.

This allows us to print almost all content of a VDV ticket in the barcode
dumping tool, as well as the removal of a lot of diagnostic code from the
actual VDV ticket parser.

The validity area structs still need work to properly decode those, but I
yet have to find the official documents describing those.  We should have
enough information to decode 0080VU blocks in UIC 918.3 tickets now though.

Also add SPDX annotations to the build system files while at it.

Most importantly this now makes the endian conversion transparent, even
for the unusual 3 byte numeric types we couldn't handle before. This also
adds implicit conversion for the date and date/time types.

This removes the hardcoded block id strings all over the place.

This is currently done adhoc in Uic9183Parser with magic numbers spread
all over.

This is the low-level format behind Thalys tickets, and will allow us to
extract more information from those once the Thalys extracts is ported to
use this.

Also add a simple tool to dump the low-level content of ticket barcodes,
to be extended especially for the other binary formats.

(cherry picked from commit 8a7d9c32)