Added initial support for plugin channels with WECUI

src/main/java/com/sk89q/worldedit/cui/SelectionCylinderEvent.java

@@ -23,8 +23,8 @@ import com.sk89q.worldedit.Vector2D;
 
 public class SelectionCylinderEvent implements CUIEvent {
 
-    protected Vector pos;
-    protected Vector2D radius;
+    protected final Vector pos;
+    protected final Vector2D radius;
 
     public SelectionCylinderEvent(Vector pos, Vector2D radius) {
         this.pos = pos;

src/main/java/com/sk89q/worldedit/cui/SelectionEllipsoidPointEvent.java

@@ -22,8 +22,8 @@ package com.sk89q.worldedit.cui;
 import com.sk89q.worldedit.Vector;
 
 public class SelectionEllipsoidPointEvent implements CUIEvent {
-    protected int id;
-    protected Vector pos;
+    protected final int id;
+    protected final Vector pos;
 
     public SelectionEllipsoidPointEvent(int id, Vector pos) {
         this.id = id;

src/main/java/com/sk89q/worldedit/cui/SelectionMinMaxEvent.java

@@ -21,8 +21,8 @@ package com.sk89q.worldedit.cui;
 
 public class SelectionMinMaxEvent implements CUIEvent {
 
-    protected int min;
-    protected int max;
+    protected final int min;
+    protected final int max;
 
     public SelectionMinMaxEvent(int min, int max) {
         this.min = min;

src/main/java/com/sk89q/worldedit/cui/SelectionPoint2DEvent.java

@@ -24,10 +24,10 @@ import com.sk89q.worldedit.Vector2D;
 
 public class SelectionPoint2DEvent implements CUIEvent {
 
-    protected int id;
-    protected int blockx;
-    protected int blockz;
-    protected int area;
+    protected final int id;
+    protected final int blockx;
+    protected final int blockz;
+    protected final int area;
 
     public SelectionPoint2DEvent(int id, Vector2D pos, int area) {
         this.id = id;

src/main/java/com/sk89q/worldedit/cui/SelectionPointEvent.java

@@ -23,9 +23,9 @@ import com.sk89q.worldedit.Vector;
 
 public class SelectionPointEvent implements CUIEvent {
 
-    protected int id;
-    protected Vector pos;
-    protected int area;
+    protected final int id;
+    protected final Vector pos;
+    protected final int area;
 
     public SelectionPointEvent(int id, Vector pos, int area) {
         this.id = id;

src/main/java/com/sk89q/worldedit/cui/SelectionShapeEvent.java

@@ -21,7 +21,7 @@ package com.sk89q.worldedit.cui;
 
 public class SelectionShapeEvent implements CUIEvent {
 
-    protected String shapeName;
+    protected final String shapeName;
 
     public SelectionShapeEvent(String shapeName) {
         this.shapeName = shapeName;