Finish new Message component, integrate into application

Also:
- New schema version 8 with video/image thumbnails, screenshots, sizes
- Upgrade messages not at current schema version when loading messages
  to show in conversation
- New MessageDetail react component
- New ConversationHeader react component

ts/components/conversation/VerificationNotification.md

@@ -0,0 +1,49 @@
+### Marking as verified
+
+```js
+<util.ConversationContext theme={util.theme}>
+  <VerificationNotification
+    type="markVerified"
+    isLocal={true}
+    contact={{
+      phoneNumber: '(202) 555-0003',
+      profileName: 'Mr. Fire',
+    }}
+    i18n={util.i18n}
+  />
+  <VerificationNotification
+    type="markVerified"
+    isLocal={false}
+    contact={{
+      phoneNumber: '(202) 555-0003',
+      profileName: 'Mr. Fire',
+    }}
+    i18n={util.i18n}
+  />
+</util.ConversationContext>
+```
+
+### Marking as not verified
+
+```js
+<util.ConversationContext theme={util.theme}>
+  <VerificationNotification
+    type="markNotVerified"
+    isLocal={true}
+    contact={{
+      phoneNumber: '(202) 555-0003',
+      profileName: 'Mr. Fire',
+    }}
+    i18n={util.i18n}
+  />
+  <VerificationNotification
+    type="markNotVerified"
+    isLocal={false}
+    contact={{
+      phoneNumber: '(202) 555-0003',
+      profileName: 'Mr. Fire',
+    }}
+    i18n={util.i18n}
+  />
+</util.ConversationContext>
+```