Overhaul Client State Handling

[Sheikah45]

Currently the client maintains most state in the various UI controllers. This results in the view elements needing to be cached so as to not lose state. This is suboptimal because it has lead to memory leaks where some ui elements cannot be garbage collected even when they are removed from the scene.

Additionally there is no cleanup of elements and their listeners when they are removed from the UI which also contributes to memory leaks.

This PR aims to overhaul the state maintenance of the client such that views are just displays and can be created and discarded at will.

Tasks

• Remove Google Event Bus (Deprecated Global Event Bus)
• Don't force chat controller to be initialized
• Remove controller caching
• Remove controller memory leaks
• Introduce simple controller initialization and cleanup
• Cleanup circular dependencies
• Make UI population lazy

Closes #2994
Closes #3016
Closes #3018

[codecov]

Codecov Report

Merging #3050 (f9cceb2) into develop (7e39b73) will decrease coverage by 0.16%.
The diff coverage is 62.59%.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #3050      +/-   ##
=============================================
- Coverage      58.88%   58.72%   -0.16%     
+ Complexity      4461     4459       -2     
=============================================
  Files            558      560       +2     
  Lines          20201    20458     +257     
  Branches        1035     1036       +1     
=============================================
+ Hits           11895    12014     +119     
- Misses          7757     7900     +143     
+ Partials         549      544       -5     

Files	Coverage Δ
...client/achievements/AchievementItemController.java	100.00% <ø> (ø)
.../main/java/com/faforever/client/api/IceServer.java	100.00% <100.00%> (ø)
.../java/com/faforever/client/audio/AudioService.java	100.00% <100.00%> (ø)
...ava/com/faforever/client/avatar/AvatarService.java	100.00% <100.00%> (+18.18%)	⬆️
...orever/client/chat/ChatCategoryItemController.java	65.51% <100.00%> (-0.59%)	⬇️
...ava/com/faforever/client/chat/ChatChannelUser.java	93.93% <100.00%> (+4.75%)	⬆️
...om/faforever/client/chat/TrustEveryoneFactory.java	25.00% <ø> (ø)
...r/client/chat/UserListCustomizationController.java	100.00% <ø> (ø)
...ever/client/chat/emoticons/EmoticonController.java	100.00% <ø> (ø)
...lient/chat/emoticons/EmoticonsGroupController.java	100.00% <ø> (ø)
... and 193 more

... and 20 files with indirect coverage changes

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