Fix FrameContainerComparator.

Fix almost all remaining FrameContainer refs.

Fix a bunch more FrameContainer references.

Add a who type method to GroupChat.

Weaken some things to WindowModel.

Make CommandParser use WindowModel.

Make UIs use WindowModel more.

Make WindowManager use WindowModel.

Change some FrameContainers to WindowModels.

Make Connection return a WindowModel.

Start to move FrameContainers behind an iface so they can be
pulled out.

For now, just cast back when needed.

Make Chat return a WindowModel.

Switch QuerySelfExternal{Action,Message} to events.

Start to move FrameContainers behind an iface so they can be
pulled out.

For now, just cast back when needed.

Use an EvictingQueue instead of RollingList.

Turn giant foreach thing into a stream chain.

Remove Query.getHost.

Only one place in the core needs the silly IRC format, so just
inline it there.

Fix CoreErrorsDialogModel adding duplicate errors.

Remove use of WeakList.

This is fairly trivial to implement with streams/lambdas,
no need to have our own hand-rolled list implementation
for it.

Fix CME in ConfigManager.removeListeners.

Fixes #521
Fixes #522

Use Multimap instead of MapList.

Tidy up DisplayProperty a bit.

Finish removing sendwho functionality.