Initial pass at an UnreadStatusManager.

Needs to allow configuring of the colours, and provide events
for notifying the UI.

Tidy SetNickColour, fix unit test.

Switch SetNickColour to use DisplayProperties

Fix Topic unit test.

Make more things use GroupChatUser.

Use GroupChat in Connection.getChannels().

  - Also by AutoValue Topic
  - Also make getUser in Topic Optional

Fix the channel message sink actually doing common channels...
I guess we're not really using that one.

Use GroupChat in Connection.getChannel().

Force a single global AutoCommand.

Handle GroupChatUser + User in processNotificationArg

Make AutoCommand use AutoValue.

Add package private constructors for AutoValues.

More GroupChatUsers.

Add a remove method ti DisplayPropertyMap.

Store parser objects in ChannelClient and Client

Small changes to GroupChat/Connection interfaces.

Use GroupChatUser some more.

Remove TopicChangeListener. Add Topic to topic events.

Remove random unused, confusing Profile thing.

Fix EventFormatter recursively formatting messages.

Fixes #280

Add topic unset event.

Fixes #120