Data Initializer for sampleapp

[SebastianSchmidl]

Fixes #53

Proposed Changes

• Mixin for Dactors (called DataInitializer) handling loading data from CSVs into the internal relations
• Mixin DefaultMessageHandling instead of overwriting unhandled in Dactor
• Dactor responsible for system startup and loading our testsdata --> SystemInitializer
• Manifest data in resources folder
• let all sampleapp dactors support data initializing and default message handling
• addition to CSVParser:
  • ability to process java.io.Streams
  • use these streams in DataInitializer
  • getClass.getResourceAsStream(name): InputStream does also work for resources inside jars, whereas getClass.getResource(name): File does not!

Related

• CSV Parser for DataInitializer #81 (merge first)