fix for #950

[FrankHossfeld]

This PR fixes the issue #950 & #227.

Changes:

• add a dependency management to the parent pom
• add a plugin management to the parent pom
• remove all version-tags from dependencies that are managed inside the dependencyManagement and plugins that are managed inside the pluginManagement in the child pom (library & validator & cli)
• remove the maven-shade-plugin (library-module-pom)
• remove the maven-shade-plugin (validator-module-pom)
• add main class in the maven-shade-plugin of the cli pom
• add two dependencies to avoid the CNFE while running the cli (Uber-Jar - Warum? #227)

After merging, no shaded library will be create anymore for the library- and the validator-module.