Net relay should measure ping to players and Widelands should show it in the UI

[bunnybot]

Pulled out from https://code.launchpad.net/~widelands-dev/widelands/net-relay/+merge/332386

Since the net relay can measure ping to all players, it can identify "black sheeps" that lack the game. The host (or even better all players) of the game should be able to see this information somewhere in-game and the host can decide to kick a player/observer because of this.

The natural place for this would be in the chat window - e.g. we could add a list of participants in the chat window in game and add ping times as green/yellow/red indicators next to it.

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Imported from Launchpad using lp2gh.

• date created: 2017-11-27T11:58:26Z
• owner: sirver
• the launchpad url was https://bugs.launchpad.net/bugs/1734673

[bunnybot]

(by gunchleoc)
A list of participants would be awesome in any case. Especially if the username gets pasted into the editbox if you click on one - that will make whispering easier too.

[klaus-halfmann]

I get these warnings:

3236-player-list/src/wui/CMakeLists.txt:1: 
wui_player_list misses DEPENDS on logic_constants, because it includes logic/widelands.h
wui_player_list misses DEPENDS on network, because it includes network/participantlist.h
wui_player_list misses DEPENDS on graphic_image_cache, because it includes graphic/image_cache.h
wui_player_list misses DEPENDS on graphic_playercolor, because it includes graphic/playercolor.h
wui_player_list DEPENDS on graphic_styles, but includes none of its headers.

[klaus-halfmann]

src/logic/mutable_addon.h:101:3: warning: extra ';' after member function definition

[matthiakl]

src/logic/mutable_addon.h:101:3: warning: extra ';' after member function definition

Unrelated. I will fix it in my current PR (#4678)

[Notabilis]

Unrelated. I will fix it in my current PR (#4678)

Indeed. I fixed it anyway, but should merge fine with your PR I think.