Merge preparation: integration of open PRs and regeneration

[ipa-nhg]

Includes:

• Add for the ComponentInterface the optional EReference to the original node that instantiates it #124 Add for the ComponentInterface the optional EReference to the original node that instantiates it
• Correct name of the Struct for the Xtext grammar #120 Correct name of the Struct for the Xtext grammar
• Simplify the grammar of the ROS model DSL #122 Simplify the grammar of the ROS model DSL

[ipa-nhg]

Related to:

• Update models to the new ros-model version RosCommonObjects#1
• Update models to the new ros-model version ipa-nhg/ros-model-examples#4
• New ros model version0803 ipa-nhg/ros-model-experiments#5
• Update models to the new ros-model version rosin-project/rosin-experiments#20
• https://gitlab.cc-asp.fraunhofer.de/ipa326/demonstrator/326_demo_ur/-/merge_requests/8
• update the python API to support the new models format  ros2model#4
• update the python API to support the new models format  ipa-nhg/ros_graph_parser#7

[ipa-nhg]

For this version of the code and to facilitate the test, I made available a pre-release of the ROS tooling under http://ros-model.seronet-project.de/updatesite/1.4.0_GrammarSimplification/latest/

To install it please follow the next steps:

Install Eclipse using the official installer. In Eclipse, go to Help > Install New Software.... And add to the update site the URL http://ros-model.seronet-project.de/updatesite/1.4.0_GrammarSimplification/latest/ in the "Work with" section.

If none package is listed, please uncheck the option Group items by category. The category ROS Model appears in the Name area. Check the box in front of ROS model and click Next to review the list of items to be installed. Click Next again to read and accept the terms of the license agreements and afterwards click Finish. Eclipse will then start to install the ROS tooling and its dependencies. If you get a security warning about the authenticity, click OK. Finally, when asked, restart Eclipse to complete the installation process.