Empathy
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Features (likely) requiring only client changes
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* Make new categories appear at the top of the list

  Note: We may not want this for sake of keeping the UI stable---this
  is already a bit of a problem with the "Start Game" button which is
  now appearing at the top of the list of categories. What I mean by
  "stability" of the UI is that we don't want a user to be reaching
  out to tap a vote button for a category and then have the category
  vote button shift to a different location before they reach it.

* Make the "vote_against" button move a prompt down to the bottom of
  the list and gray it out. This could be a better approach than
  making the category entirely disappear.

* Un-gray-out a prompt when a player votes for it

* Make scores available at screens other than the category-selection screen

Add a TWINNER achievement

Add support for an initial number spelled out

Allow clients to see previous round scores by swiping left

Figure out why Nancy's computer doesn't work at all

Auto-focus first text field

Style focus highlight for TAB-based navigation

Empires
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Convert HTML/JavaScript client to React

Add UI for combining/splitting empires, (modeled after the judging
interface in Empathy).

Add a chat interface for sending messages to the current empire (with
no history beyond a single message per sender)