build lanelet2 ready for release and packaging

[mantkiew]

In addition to normal development build, configure the catkin workspace to perform the install build with the target location /opt/ros/lanelet2.

Testing

1. Clean existing workspaces:

   $ cd anm_unreal_sim
   $ rm -rf .catkin_tools
   $ cd submodules/geoscenarioserver
   $ rm -rf catkin_ws

2. Run the build

   $ bash scripts/install_dependencies.bash

3. It should have created the folder catkin_ws/install/opt/ros/lanelet2 workspace containing setup.bash.
4. Move the workspace to the target location

   $ sudo mv catkin_ws/install/opt/ros/lanelet2/ /opt/ros

5. Check PYTHONPATH before and after sourcing:

   $ echo $PYTHONPATH 
   /opt/ros/road-demo/lib/python2.7/dist-packages:/opt/ros/melodic/lib/python2.7/dist-packages
   $ source /opt/ros/lanelet2/setup.bash 
   $ echo $PYTHONPATH 
   /opt/ros/lanelet2/lib/python3/dist-packages:/opt/ros/melodic/lib/python3/dist-packages:/opt/ros/road-demo/lib/python2.7/dist-packages:/opt/ros/melodic/lib/python2.7/dist-packages

6. Verify the library can be loaded in Python3.8

   $ python3.8
   >>> import lanelet2
   >>> 

   No error should be displayed.

[WAEliasmith]

Worked for me