Added a server managed notion of which client is controlling the game.

Doing this on the client, while theoretically possible, is more complex. We
have a server, we use it to provide commonly needed services, the assignment of
a single client to control the game is a commonly needed service. This also
matches the way other services like turn change and game start and end are
implemented.

A side note: the client-side code was not properly handling disconnected
players, which the server code properly handles.


git-svn-id: svn+ssh://src.earth.threerings.net/vilya/trunk@224 c613c5cb-e716-0410-b11b-feb51c14d237

build.xml

@@ -149,7 +149,7 @@
     </javac>
   </target>
 
-  <!-- build the javadoc documentation -->
+  <!-- builds the javadoc documentation -->
   <target name="javadoc" depends="prepare">
     <javadoc sourcepath="src/java" packagenames="com.threerings.*"
              destdir="${javadoc.home}" stylesheetfile="docs/stylesheet.css"