UR tools upgrade
- upgraded SDK version too 1.9.0.
- updated URSim version to 3.12.1.
- added git dpull and pfetch aliases on Docker image.
- added ellipse swing sample as submodule.
- added HelloWorldSwing tutorial as submodule.
- added the download of the Swing based URCap tutorial in PDF format inside the ur_build_image.sh script.