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/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);