v5.1.0 SCXML ftw

new behavior

• feature(parse): add scxml as an import format (#61)

technical updates

• doc(types|api): describe how to add a renderer, more strongly type definitions in /types, brush-up of the api doc (#62)
• build(npm): ⬆️ fast-xml-parser, query-string, webpack
• build(make): simplify webpack conf