Project Git bot

Areas of responsibility

Keep ProjectGit in sync with packages in the organization
- on pushes to package, updates the submodule commit id to the default branch HEAD (as configured in Gitea)
- on package adds, creates a new submodule
- on package removal, removes the submodule
Assumes:
- config.GitProjectName == project name (default: _ObsPrj)
- Other repositories == packages (similar to OBS project)

Devel project, where direct pushes to package git are possible