Nico Weber 7296b0fa43 LibGfx/JPEG2000: Implement tag trees ...

A tag tree is a data structure used for deserializing JPEG2000
packet headers.

We don't use them for anything yet, except from tests.

The implementation feels a bit awkward to me, but we can always polish
it later.

The spec thankfully includes two concrete examples. The code is
correct enough to pass those -- I added them as test.

2024-04-16 00:40:16 +02:00

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