Improves CUI support.

1. Allows CUI handshake package to overwrite protocol version.
2. Sends the current selection on handshake.
3. Removed redundant SelectionShapeEvents.

Conflicts:
	src/main/java/com/sk89q/worldedit/regions/selector/ConvexPolyhedralRegionSelector.java
	src/main/java/com/sk89q/worldedit/regions/selector/CylinderRegionSelector.java

src/bukkit/java/com/sk89q/worldedit/bukkit/CUIChannelListener.java

@@ -40,11 +40,8 @@ public class CUIChannelListener implements PluginMessageListener {
     @Override
     public void onPluginMessageReceived(String channel, Player player, byte[] message) {
         LocalSession session = plugin.getSession(player);
-        if (session.hasCUISupport()) { // Already initialized
-            return;
-        }
-
         String text = new String(message, UTF_8_CHARSET);
         session.handleCUIInitializationMessage(text);
+        session.describeCUI(plugin.wrapPlayer(player));
     }
 }

src/main/java/com/sk89q/worldedit/LocalSession.java

@@ -625,10 +625,6 @@ public class LocalSession {
     }
 
     public void handleCUIInitializationMessage(String text) {
-        if (hasCUISupport()) {
-            return;
-        }
-
         String[] split = text.split("\\|");
         if (split.length > 1 && split[0].equalsIgnoreCase("v")) { // enough fields and right message
             setCUISupport(true);

src/main/java/com/sk89q/worldedit/regions/selector/ConvexPolyhedralRegionSelector.java

@@ -206,8 +206,6 @@ public class ConvexPolyhedralRegionSelector extends com.sk89q.worldedit.regions.
         Collection<Vector> vertices = region.getVertices();
         Collection<Triangle> triangles = region.getTriangles();
 
-        player.dispatchCUIEvent(new SelectionShapeEvent(getTypeID()));
-
         Map<Vector, Integer> vertexIds = new HashMap<Vector, Integer>(vertices.size());
         int lastVertexId = -1;
         for (Vector vertex : vertices) {
@@ -234,8 +232,6 @@ public class ConvexPolyhedralRegionSelector extends com.sk89q.worldedit.regions.
         if (isDefined()) {
             session.dispatchCUIEvent(player, new SelectionPointEvent(0, region.getMinimumPoint(), getArea()));
             session.dispatchCUIEvent(player, new SelectionPointEvent(1, region.getMaximumPoint(), getArea()));
-        } else {
-            session.dispatchCUIEvent(player, new SelectionShapeEvent(getLegacyTypeID()));
         }
     }
 

src/main/java/com/sk89q/worldedit/regions/selector/CylinderRegionSelector.java

@@ -237,8 +237,6 @@ public class CylinderRegionSelector extends com.sk89q.worldedit.regions.Cylinder
         if (isDefined()) {
             session.dispatchCUIEvent(player, new SelectionPointEvent(0, region.getMinimumPoint(), getArea()));
             session.dispatchCUIEvent(player, new SelectionPointEvent(1, region.getMaximumPoint(), getArea()));
-        } else {
-            session.dispatchCUIEvent(player, new SelectionShapeEvent(getLegacyTypeID()));
         }
     }