Move message handling to ChatChannel and out of ChatController

[Sheikah45]

No description provided.

[codecov]

Codecov Report

Merging #2961 (0183164) into develop (1ac7748) will increase coverage by 0.00%.
The diff coverage is 65.76%.

Additional details and impacted files

@@            Coverage Diff             @@
##             develop    #2961   +/-   ##
==========================================
  Coverage      64.70%   64.71%           
+ Complexity      4898     4880   -18     
==========================================
  Files            556      554    -2     
  Lines          20261    20217   -44     
  Branches        1084     1081    -3     
==========================================
- Hits           13110    13083   -27     
+ Misses          6520     6503   -17     
  Partials         631      631           

Impacted Files	Coverage Δ
.../java/com/faforever/client/fx/BrowserCallback.java	14.28% <0.00%> (ø)
...forever/client/chat/MatchmakingChatController.java	62.79% <40.00%> (-10.13%)	⬇️
...aforever/client/chat/PrivateChatTabController.java	74.19% <55.55%> (-1.22%)	⬇️
...java/com/faforever/client/chat/ChatController.java	57.95% <55.76%> (-1.04%)	⬇️
...a/com/faforever/client/chat/KittehChatService.java	72.58% <66.66%> (-1.14%)	⬇️
...in/java/com/faforever/client/chat/ChatChannel.java	80.95% <69.23%> (+0.18%)	⬆️
...forever/client/chat/AbstractChatTabController.java	74.40% <80.64%> (-0.52%)	⬇️
...om/faforever/client/chat/ChannelTabController.java	88.46% <92.85%> (+1.15%)	⬆️
...in/java/com/faforever/client/chat/ChatMessage.java	100.00% <100.00%> (ø)
...ent/teammatchmaking/TeamMatchmakingController.java	95.05% <100.00%> (-0.09%)	⬇️

... and 2 files with indirect coverage changes

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