Removed unused copy methods, no longer needed

src/main/java/com/mojang/brigadier/context/CommandContext.java

@@ -79,9 +79,4 @@ public class CommandContext<S> {
         return nodes;
     }
 
-    public CommandContext<S> copy() {
-        final Map<String, ParsedArgument<S, ?>> arguments = Maps.newLinkedHashMap();
-        this.arguments.forEach((k, v) -> arguments.put(k, v.copy()));
-        return new CommandContext<>(source, arguments, command, nodes, input);
-    }
 }

src/main/java/com/mojang/brigadier/context/CommandContextBuilder.java

@@ -55,7 +55,7 @@ public class CommandContextBuilder<S> {
     public CommandContextBuilder<S> copy() {
         final CommandContextBuilder<S> copy = new CommandContextBuilder<>(dispatcher, source);
         copy.command = this.command;
-        arguments.forEach((k, v) -> copy.arguments.put(k, v.copy()));
+        copy.arguments.putAll(arguments);
         copy.nodes.putAll(this.nodes);
         copy.input.append(input);
         return copy;

src/main/java/com/mojang/brigadier/context/ParsedArgument.java

@@ -37,7 +37,4 @@ public class ParsedArgument<S, T> {
         return result;
     }
 
-    public ParsedArgument<S, T> copy() {
-        return new ParsedArgument<>(raw, result);
-    }
 }