changelog: release v0.18.7

translate: fix in finding all embedded reference texts

downgrade minicbor to keep supporting edition 2021 for now

downgrade base16ct dependency so we don't require rust edition 2024 yet

webanno: fixup, also strip extra_context prefixes when predicate is N…

…OT an iri

it may be an alias too

webanno: added {resource_iri} variable for extra targets, and {resour…

…ce} now yields only the ID

fixup: IdStrategy from &str instead of String

minor cleanup

dependency updates

Revert "webanno: implemented support for nested maps in the body of W…

…3C Web Annotation output"

This was too patchy, I don't like it.

This reverts commit 948b90e.