decoder: fix nanocbor_skip() for tags #91
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As per RFC8949, tags consist of both a tag number and an enclosed data item. When skipping a tag, the enclosed data item should be skipped, too.
This PR adds several tests for
nanocbor_skip()for (nested) arrays and maps, and fixes the behavior when skipping a CBOR tag: It now skips the enclosed data item and only decrementsit->remainingby one (if applicable).