[NEW] Add back reactions handler, fix missing delegate reference and more

[rafaelks]

@RocketChat/ios

• Add back reactions tapping handler;
• Fixed problem when missing delegate reference during data creation;
• Uncomment codes in the app that is now working;
• Removed duplicated code;
• Update colors for self-mentions, normal mentions and links;

[houndci-bot]

Line Length Violation: Line should be 120 characters or less: currently 126 characters (line_length)

[houndci-bot]

Todo Violation: TODOs should be resolved. (todo)

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (develop@db21022). Click here to learn what that means.
The diff coverage is 0%.

@@            Coverage Diff             @@
##             develop    #2317   +/-   ##
==========================================
  Coverage           ?   26.09%           
==========================================
  Files              ?      439           
  Lines              ?    16058           
  Branches           ?        0           
==========================================
  Hits               ?     4190           
  Misses             ?    11868           
  Partials           ?        0

Impacted Files	Coverage Δ
...at/Views/Chat/New Chat/Cells/BaseMessageCell.swift	0% <ø> (ø)
...Chat/Controllers/Chat/MessagesViewController.swift	36.63% <ø> (ø)
...ews/Chat/New Chat/Cells/BaseQuoteMessageCell.swift	0% <0%> (ø)
Rocket.Chat/Managers/AppManager.swift	42.75% <0%> (ø)
...ws/Chat/New Chat/ChatItems/ReactionsChatItem.swift	0% <0%> (ø)
Rocket.Chat/Extensions/UIColorExtension.swift	56.81% <0%> (ø)
...Controllers/Chat/ChatSections/MessageSection.swift	4.58% <0%> (ø)
...at/MessagesViewControllerMessageCellProtocol.swift	0% <0%> (ø)
...Chat/Views/Chat/New Chat/Cells/ReactionsCell.swift	0% <0%> (ø)
...t.Chat/Views/Cells/Chat/ChatMessageImageView.swift	72.09% <0%> (ø)
... and 3 more

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[filipealva]

It's awesome!! 💯