https://github.com/sendbird/sendbird-uikit-ios/releases/tag/v2.1.12
• Added filtering logics for channel events by custom message list params
• Added filtering logics for channel list events by custom channel list query
• Changed didReceiveError function name to errorHandler.
• Added error code in error handler.
• Modified SBUStringSet
• PhotoVideoLibrary
• Message_Edited
• MemberList_Unban
• Modified on long tap gesture menu
• stringSet Remove to Delete
• colorSet removeItemColor to deleteItemColor
• Fixed cannot customize rightBarButton on SBUOpenChannelViewController
• Improved stability
