Wdmapper

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- Fix lookup by URI Template

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- Prefer property P1921 (RDF URI Template) over P1630 (formatter URL)

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- Use empty string instead of Wikidata-ID as default annotation
- Allow to disable labels by setting language to empty string

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- Extend output formats
- Fix Unicode output when writing to files

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- Add 'quicks' output format for deltas to be used in QuickStatements tool
- Remove 'help' command

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- Add 'json' output format (JSKOS Concept Mappings, .ndjson)
- Include source and target concept scheme URI if available