annotation/stam-rust: v0.18.2

Various fixes and improvements

• webanno: properly translate multiple identical keys to a list
• webanno: allow multiple extra target templates
• webanno: added {resource_iri} variable for extra targets, and {resource} now yields only the ID
• fixed parsing IdStrategy
• implemented textselection_count() function on ResultItem<Annotation>
• translate/transpose: big performance improvement by pre-computing some things
• Added AnnotationStore.reannotate() method to modify existing annotations