Emojification now all done with react via a few new components

Three locations were changed:
  1. a group update, which lists a set of contacts
  2. the contact name in the left pane
  3. the conversation title

Three new components were added to window.Signal.Components to support
these scenarios, respectively:
  1. Emojify
  2. ContactName
  3. ConversationTitle

Note that there are a number of other places in the app that should be
emojified, but never have been before. Essentially any place that a
contact name might be shown. A non-exhaustive list:
  - Show group members
  - Show safety number
  - Verified change notification
  - Disappearing timer change notification
  - Contact verification notification
  - Quote contact name

ts/styleguide/StyleGuideUtil.ts

@@ -165,7 +165,7 @@ const COLORS = [
 ];
 
 const CONTACTS = COLORS.map((color, index) => {
-  const title = `${sample(['Mr.', 'Mrs.', 'Ms.', 'Unknown'])} ${color}`;
+  const title = `${sample(['Mr.', 'Mrs.', 'Ms.', 'Unknown'])} ${color} 🔥`;
   const key = sample(['name', 'profileName']) as string;
   const id = `+1202555${padStart(index.toString(), 4, '0')}`;