Remove plugin code

catkin_ws/src/learn_environment/CMakeLists.txt

catkin_ws/src/learn_environment/LICENSE

catkin_ws/src/learn_environment/README.md

catkin_ws/src/learn_environment/converter/waypoints.py

catkin_ws/src/learn_environment/developer_docs/CONTRIBUTE.md

...src/learn_environment/developer_docs/codebase_overview.md

...rn_environment/developer_docs/define_difficulty_levels.md

...n_ws/src/learn_environment/developer_docs/define_tasks.md

..._ws/src/learn_environment/developer_docs/define_topics.md

...environment/developer_docs/doxygen_documentation/Doxyfile

...t/developer_docs/doxygen_documentation/class_diagram.puml

.../developer_docs/doxygen_documentation/html/annotated.html

...onment/developer_docs/doxygen_documentation/html/bc_s.png

...nment/developer_docs/doxygen_documentation/html/bc_sd.png

...gen_documentation/html/classCustomListWidget-members.html

...ocs/doxygen_documentation/html/classCustomListWidget.html

...documentation/html/classCustomListWidget__coll__graph.map

...documentation/html/classCustomListWidget__coll__graph.md5

...documentation/html/classCustomListWidget__coll__graph.png

...umentation/html/classCustomListWidget__inherit__graph.map