style: Organize code, Remove unused imports

Source/CharacterPlugin/Private/CharacterPlugin.cpp

Source/CharacterPlugin/Private/Crowds/Predictive.cpp

.../CharacterPlugin/Private/Crowds/Spawner/CircleSpawner.cpp

Source/CharacterPlugin/Private/Crowds/VHsManager.cpp

...rPlugin/Private/Crowds/VelocityPostProcessorComponent.cpp

...CharacterPlugin/Private/FaceAnimation/VHFaceAnimation.cpp

...acterPlugin/Private/FaceAnimation/VHFacialExpressions.cpp

Source/CharacterPlugin/Private/FaceAnimation/VHGazing.cpp

...rPlugin/Private/FaceAnimation/VHLiveLinkFaceAnimation.cpp

...CharacterPlugin/Private/FaceAnimation/VHOculusLipSync.cpp

...acterPlugin/Private/FaceAnimation/VHOpenFaceAnimation.cpp

Source/CharacterPlugin/Private/FaceAnimation/VHSpeech.cpp

Source/CharacterPlugin/Private/SocialGroups/SocialGroup.cpp

...CharacterPlugin/Private/SocialGroups/SocialGroupState.cpp

...ugin/Private/SocialGroups/SocialGroupStates/SG_Gazing.cpp

...Plugin/Private/SocialGroups/SocialGroupStates/SG_Idle.cpp

...e/CharacterPlugin/Private/SocialGroups/VHSocialGroups.cpp

Source/CharacterPlugin/Private/VHListenerBackchannels.cpp

Source/CharacterPlugin/Private/VHMovement.cpp

Source/CharacterPlugin/Private/VHPointing.cpp