Make api objects immutable

[Sheikah45]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 72.53470% with 376 lines in your changes are missing coverage. Please review.

Project coverage is 58.73%. Comparing base (05eea7a) to head (cfa3fd1).

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #3140      +/-   ##
=============================================
- Coverage      59.54%   58.73%   -0.82%     
+ Complexity      4465     3990     -475     
=============================================
  Files            576      574       -2     
  Lines          20677    19203    -1474     
  Branches        1005     1013       +8     
=============================================
- Hits           12312    11278    -1034     
+ Misses          7837     7433     -404     
+ Partials         528      492      -36     

Files	Coverage Δ
.../java/com/faforever/client/api/FafApiAccessor.java	90.12% <100.00%> (+0.06%)	⬆️
.../main/java/com/faforever/client/avatar/Avatar.java	100.00% <100.00%> (ø)
...ava/com/faforever/client/avatar/AvatarService.java	100.00% <100.00%> (ø)
...ava/com/faforever/client/chat/ChatChannelUser.java	90.90% <100.00%> (ø)
...m/faforever/client/chat/ChatMessageController.java	79.89% <100.00%> (-0.33%)	⬇️
...a/com/faforever/client/chat/KittehChatService.java	72.76% <100.00%> (-0.11%)	⬇️
...forever/client/chat/MatchmakingChatController.java	100.00% <100.00%> (ø)
...aforever/client/chat/PrivateChatTabController.java	100.00% <100.00%> (ø)
...in/java/com/faforever/client/clan/ClanService.java	71.42% <100.00%> (-3.58%)	⬇️
...a/com/faforever/client/domain/api/CoopMission.java	100.00% <100.00%> (ø)
... and 176 more

... and 2 files with indirect coverage changes

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