Use server state to mark players as offline

[Sheikah45]

Requires FAForever/server#832

[codecov]

Codecov Report

Attention: 18 lines in your changes are missing coverage. Please review.

Comparison is base (d8c11ad) 58.95% compared to head (05fbae0) 58.97%.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #3104      +/-   ##
=============================================
+ Coverage      58.95%   58.97%   +0.02%     
- Complexity      4381     4395      +14     
=============================================
  Files            567      568       +1     
  Lines          20006    20038      +32     
  Branches         983      983              
=============================================
+ Hits           11795    11818      +23     
- Misses          7700     7707       +7     
- Partials         511      513       +2     

Files	Coverage Δ
.../faforever/client/chat/ChatUserItemController.java	63.97% <100.00%> (ø)
...orever/client/filter/ChatUserFilterController.java	84.09% <100.00%> (+2.03%)	⬆️
...rever/client/fx/contextmenu/WatchGameMenuItem.java	100.00% <100.00%> (ø)
...va/com/faforever/client/game/PlayerGameStatus.java	100.00% <100.00%> (ø)
...ever/client/leaderboard/LeaderboardController.java	91.04% <100.00%> (ø)
...main/java/com/faforever/client/map/MapService.java	71.30% <100.00%> (-0.30%)	⬇️
...java/com/faforever/client/player/ServerStatus.java	100.00% <100.00%> (ø)
...ent/teammatchmaking/PartyMemberItemController.java	80.23% <100.00%> (ø)
...in/java/com/faforever/client/domain/PartyBean.java	83.87% <50.00%> (ø)
...er/client/fx/contextmenu/InvitePlayerMenuItem.java	83.33% <0.00%> (ø)
... and 6 more

... and 4 files with indirect coverage changes

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