ALT-↑ and ALT-↓ change the active conversation, based on its position
in the main window's ConversationListView. If a conversation is
registered by the main window, and no other conversation is selected, it
is automatically selected.
Removes explicit setting of sizes in ConversationView and StatusView,
allowing them to be resized appropriately. Also rearranges StatusView
somewhat, so that it's more friendly to smaller sizes. (The avatar is
moved from being beside the status menu field to being beside the
nickname textbox.)
Now all active conversations will be listed in the main window, in a
ConversationListView. Clicking one of the items will open its
conversation window as you'd expect, etc.