Implements very basic GEF editor functionality

- Load the SaltProject from the SaltProject.salt file

- Extract the SDocumentGraph from that SaltProject and set it as Contens
of the GraphicalViewer of the editor

- Implements Figures, EditParts, EditPartFactory for SDocumentGraph &
SToken

- Display SToken figures randomly in editor
Excludes the target platform module from the Tycho build

- Tycho will resolve dependencies from remote repositories
Draws tokens on one line, dynamically calculated