2020.3.0

Common

• Travis: build with latest stable LTS node_js 59741aa

• Improve helper scripts e4ec39d d9e74b5

• Add templates for bndtools and improve 'Implementing a Device' docs (#1040)

  • Add templates for bndtools
  • Adjust 'Implementing a Device' docs for new OSGi templates
  • See https://openems.github.io/openems.io/openems/latest/edge/implement.html
    

• Upgrade Gradle and UI dependencies

Backend

• B2bRest-Api: make sure JSON-RPC error is properly sent; (Unfortunately this requires to set Response code to OK (200)) f1432b7