Split message content into its own module

This is laying some groundwork for the rich text chatbar.

src/messagecontent/images/ferry.svg

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 22 22">
+  <defs id="defs3051">
+    <style
+       type="text/css"
+       id="current-color-scheme">
+      .ColorScheme-Text {
+        color:#4d4d4d;
+      }
+      </style>
+  </defs>
+  <path
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+</svg>