[CHORE] Remove unused code, resolve some SwiftLint warnings & suppress couple.

[rafaelks]

@RocketChat/ios

[codecov]

Codecov Report

Merging #2517 into develop will increase coverage by 0.14%.
The diff coverage is 8.82%.

@@             Coverage Diff             @@
##           develop    #2517      +/-   ##
===========================================
+ Coverage    26.41%   26.56%   +0.14%     
===========================================
  Files          457      456       -1     
  Lines        16950    16863      -87     
===========================================
+ Hits          4477     4479       +2     
+ Misses       12473    12384      -89

Impacted Files	Coverage Δ
...ews/Chat/New Chat/Cells/BaseImageMessageCell.swift	0% <ø> (ø)	⬆️
...ews/Chat/New Chat/Cells/BaseQuoteMessageCell.swift	0% <ø> (ø)	⬆️
...cket.Chat/Controllers/Chat/MessagesViewModel.swift	29.75% <ø> (ø)	⬆️
...ket.Chat/Views/Cells/Hints/TextHintLabelCell.swift	0% <ø> (ø)	⬆️
...hat/Views/Cells/Hints/UserHintAvatarViewCell.swift	0% <ø> (ø)	⬆️
.../Controllers/Chat/MessagesListViewController.swift	0% <ø> (ø)	⬆️
...at/MessagesViewControllerMessageCellProtocol.swift	0% <ø> (ø)	⬆️
...Chat/Views/Cells/Hints/TextHintEmojiViewCell.swift	0% <ø> (ø)	⬆️
Rocket.Chat/Theme/ThemeableViews.swift	51.94% <ø> (ø)	⬆️
Rocket.Chat/Views/Cells/Chat/ChatMessageCell.swift	0% <ø> (ø)	⬆️
... and 12 more

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