Release v0.8

• improve the rule checking mechanisms: adding IDs, minWords and maxWords checkers, content type checker, optimizing OR checker and range rules, successScore and
  failureScore
• improve rule output
• new schema parameters: indexField, unique, inactive
• new measurement configuration parameters: onlyIdInHeader, indexer, AnnotationCalculator
• field extractor is independent from recordId and is enabled only if there are extractable fields in the schema
• improve documentation: a section about quality diemnsions
• improving XML namespace handling.
• better CSV support
• changing to Java 11
• internal refactoring and decoupling of classes
• adding several tools to developer workflow: sonarcloud.io, coveralls, codecov, GitHub action