* added name, version, commit and operating system to user agent
* added plugins to generate required information
* added additional property file to merge the required information in existing application configuration
* added and adjusted tests

- adds sending of accept- and reject-events
- adds fit-connect problems

refactor(config): remove metadata schema from config, file is loaded implicitly via factory from resources so the user does not have to provide a schema

refactor(config): remove implicit config loading, config can only be loaded via explicit env-var or ApplicationConfigLoader

Feature/15 Java SDK MVP Part I: contains implementations for sending & subscribing to submissions, adds commandline client