Add support for use of Git repositories with inventory objects

Feature

• JS7 should integrate with a Git repository to store deployable and releasable scheduling objects managed with the JOC Cockpit GUI.
• The functionality includes to
  • read file tree from a  repository directory in the local file system
  • store scheduling objects from JOC Cockpit to a repository directory in the local file system
  • delete scheduling objects from the repository directory in the local file system
  • update JOC Cockpit from the scheduling objects in the local file system
• Objects that are managed individually per scheduling environment and objects that can be deployed across scheduling environments should not make it to the same Git repository
  • Consider settings for the classification of scheduling objects as specified with JOC-1217
  • Any file system operations are applied to a set of two repositories:
    • one for scheduling objects that are local to the environment in ./repositories/local. 
    • one for scheduling objects that can be deployed across environments in ./repositories/rollout.
• API operations and GUI actions are separately available for scheduling objects with "local" use and for scheduling objects with "rollout" use. 
  • This includes the API to offer this distinction.
  • This includes the GUI to offer separate action menus.