v3.0.0-beta.4

• Modified some view to be able to change its date format
  • Opened SBUMessageDateView
  • Opened SBUChannelCell
  • Added SBUMessageDateView.dateFormat
  • Added SBUOpenChannelContentBaseMessageCell.dateFormat
  • Added SBUMessageSearchResultCell.dateFormat
  • Added parameters to SBUChannelCell buildLastUpdatedDate(): dateFormat, timeFormat
• Added public classes and interfaces regarding message cells
  • Added open/public interfaces in message cells.
  • Added SBULinkClickableTextView
  • Added SBUMessageWebView , SBUMessageWebViewModel and SBUOpenChannelMessageWebView
  • Added SBUUserMessageTextViewDelegate , SBUUserMessageTextViewModel and SBUUserMessageTextView
  • Added SBUUserNameView
  • Added SBUFileViewerDelegate and SBUFileViewer
  • Added QuotedFileCommonContentView and QuotedFileImageContentView
  • Added SBUMessageReactionView
• Added SBUDateFormatSet
• Added Date.sbu_toString(dateFormat:localizedFormat)
• Changed Date.lastUpdatedTime function in Data+SBUIKit access level to public
• Fixed not called completion handler on unregister pushToken