Duel System

[sven-n]

Is your feature request related to a problem? Please describe.

The duel system is not implemented at all.

Describe the solution you'd like

• [x] Starting with Season 4, duels start in the duel arena map which allow spectators to watch the duel invisibly.
• [ ] In older seasons, duels just take place in the normal map, with all players and monsters around.

I think both have their pros and cons, so it would be great if we could configure (e.g. in the GameConfiguration or in a plugin configuration) which duel variant should be used.

[sven-n]

The self defense system needs to consider duels.

[sven-n]

Duel system implemented with #428. To implement the old duel system, we'd need to add packet handlers and view plugins for the older packets (codes 0xAB and 0xAC)