Added a legacy type id system to CUI.

Selection types can send fallback typeids and information now, for older WECUI versions to use.

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

@@ -570,6 +570,10 @@ public class LocalSession {
             return;
         }
 
+        final String legacyTypeId = selector.getLegacyTypeId();
+        if (legacyTypeId != null) {
+            player.dispatchCUIEvent(new SelectionShapeEvent(legacyTypeId));
+        }
         player.dispatchCUIEvent(new SelectionShapeEvent(selector.getTypeId()));
 
         if (selector instanceof CUIPointBasedRegion) {

src/main/java/com/sk89q/worldedit/regions/CuboidRegionSelector.java

@@ -177,6 +177,10 @@ public class CuboidRegionSelector implements RegionSelector, CUIPointBasedRegion
         return "cuboid";
     }
 
+    public String getLegacyTypeId() {
+        return null;
+    }
+
     public void describeCUI(LocalPlayer player) {
         if (pos1 != null) {
             player.dispatchCUIEvent(new SelectionPointEvent(0, pos1, getArea()));

src/main/java/com/sk89q/worldedit/regions/Polygonal2DRegionSelector.java

@@ -178,6 +178,10 @@ public class Polygonal2DRegionSelector implements RegionSelector, CUIPointBasedR
         return "polygon2d";
     }
 
+    public String getLegacyTypeId() {
+        return null;
+    }
+
     public int getArea() {
         return region.getArea();
     }

src/main/java/com/sk89q/worldedit/regions/RegionSelector.java

@@ -132,12 +132,19 @@ public interface RegionSelector {
     public String getTypeName();
 
     /**
-     * Get a lowecase space-less ID.
+     * Get a lowercase space-less ID.
      * 
      * @return
      */
     public String getTypeId();
 
+    /**
+     * Gets an alternative ID, for which this region selector also sends data.
+     * 
+     * @return
+     */
+    public String getLegacyTypeId();
+
     /**
      * Get lines of information about the selection.
      *