Create Central ITOM-Project

[Bernd Bertschinger]

Create Central ITOM-Project repository, which uses ITOM and designerplugins and plugins as submodules.
Enable CMAKE to build centrally from this repository by enabling a second CMAKE build and configuration order from:

1. Configure ITOM
2. Configure Plugins
3. Build ITOM
4. Build Plugins

[Johann Krauter]

created: https://github.com/itom-project/itomProject