Eliminate samskivert dependency in core.

I've long wanted to do this, but the launcher's use of all the samskivert UI
stuff made it onerous. Now that the launcher is a separate module, we can
remove the samskivert dependency in core (and tools), which simplifies things
and makes it easier to depend on core in a (future) self-updating app (when we
add support for that).

launcher/pom.xml

@@ -30,6 +30,11 @@
       <artifactId>getdown-tools</artifactId>
       <version>${project.version}</version>
     </dependency>
+    <dependency>
+      <groupId>com.samskivert</groupId>
+      <artifactId>samskivert</artifactId>
+      <version>1.2</version>
+    </dependency>
     <dependency>
       <groupId>jregistrykey</groupId>
       <artifactId>jregistrykey</artifactId>