Made every CommandNode support an executor

src/main/java/net/minecraft/commands/tree/ArgumentCommandNode.java

@@ -8,7 +8,8 @@ public class ArgumentCommandNode<T> extends CommandNode {
     private final String name;
     private final CommandArgumentType<T> type;
 
-    public ArgumentCommandNode(String name, CommandArgumentType<T> type) {
+    public ArgumentCommandNode(String name, CommandArgumentType<T> type, Runnable executor) {
+        super(executor);
         this.name = name;
         this.type = type;
     }

src/main/java/net/minecraft/commands/tree/CommandNode.java

@@ -7,8 +7,17 @@ import net.minecraft.commands.exceptions.IllegalArgumentSyntaxException;
 import java.util.List;
 
 public abstract class CommandNode {
+    private final Runnable executor;
     private final List<CommandNode> children = Lists.newArrayList();
 
+    protected CommandNode(Runnable executor) {
+        this.executor = executor;
+    }
+
+    public Runnable getExecutor() {
+        return executor;
+    }
+
     public List<CommandNode> getChildren() {
         return children;
     }

src/main/java/net/minecraft/commands/tree/LiteralCommandNode.java

@@ -5,21 +5,16 @@ import net.minecraft.commands.exceptions.IllegalArgumentSyntaxException;
 
 public class LiteralCommandNode extends CommandNode {
     private final String literal;
-    private final Runnable executor;
 
     public LiteralCommandNode(String literal, Runnable executor) {
+        super(executor);
         this.literal = literal;
-        this.executor = executor;
     }
 
     public String getLiteral() {
         return literal;
     }
 
-    public Runnable getExecutor() {
-        return executor;
-    }
-
     @Override
     public CommandNode parse(String command) throws IllegalArgumentSyntaxException, ArgumentValidationException {
         if (command.startsWith(literal)) {