Dev-build fe79c1a

Added @ALL mentions & fixed chat signing

• MentionModule: split mention() into showMention()/mention() and added mentionAll() for @ALL
• PatternModule: added "everyone" constant, @ALL pattern handling; mentions no longer require the sender to be in a channel
• ServerWideChannelHandler: send plain components instead of binding ChatType.CHAT
• PacketEventListener: disabled debug packet logging; removed dead imports\nchore: ignore .DS_Store