Add a Github Action for continuous integration tests

Minor changes in gazebo_ros_plugins to display more information during the tests

Centralize time handling

Migrated the gazebo worlds launch files to the new sim time system

* The thruster_manager tests pass

* Updated file header

* Resolved minor conflict

* Added missing files

* Changed emails, authors and copyrights

Co-authored-by: LoicLiquid
Co-authored-by: jpliquid

Update version, names

Update names, version

Update names, version

Update names, version

Update names, version

Update version, names

Update version, names

Update version, names, description

Create README.md