Hedgewars: Update command line documentation
completed by: Rowan D
mentors: Andrey Korotaev, Xeli, Sheepy, koda
Engine command line arguments changed drastically thanks to GCI: let's update the documentation on the wiki, shall we? And in the meantime check that also the frontend and server options are properly documented.
A few pages in document format, describing the solution for the stated problem. Provide any code if available.