Added support for GP course effects which are configurable by the new
file GpCourseInfo.json. Extracted 15 course entries from the packet
captures and encoded them into this file. Also added a new custom course
called "Arrowgene QOL Course" (quality of life). This is an example of
how to create new course effects which were not present when the game
was live.

- Removed unused packet req.
- Added icon_path, description and url keys to the json definition.

- Support hot reload of JSON file.
- Add known enum names to comment field of effect list.