IrcUser: default sendMessage to Irc Channel, SinkDebugMessage: whoami: remove base.toString(), add sender class
MessageCommand: Fix TabCompleter missing suffix, Debug: remove not used variables, add @Nullable's, SinkIRC: Fix not loading users, wait for AuthBot reply before joining main channel. SinkUserProvider: Rename getCommandArgsSuffix() to getTabCompleterSuffix(), fix Logger.debug()