Disable the setters for MinecraftKey, this isn't supported at all

Signed-off-by: Irmo van den Berge <irmo.vandenberge@ziggo.nl>

src/main/generated/com/bergerkiller/generated/net/minecraft/resources/MinecraftKeyHandle.java

@@ -58,10 +58,10 @@ public abstract class MinecraftKeyHandle extends Template.Handle {
     public static MinecraftKeyHandle createNew(String namespace, String name) {
         return T.createNew2.invoke(namespace, name);
     }
+    @Template.Readonly
     public abstract String getNamespace();
-    public abstract void setNamespace(String value);
+    @Template.Readonly
     public abstract String getName();
-    public abstract void setName(String value);
     /**
      * Stores class members for <b>net.minecraft.resources.MinecraftKey</b>.
      * Methods, fields, and constructors can be used without using Handle Objects.
@@ -70,7 +70,9 @@ public abstract class MinecraftKeyHandle extends Template.Handle {
         @Template.Optional
         public final Template.Constructor<Object> constr_code_parts = new Template.Constructor<Object>();
 
+        @Template.Readonly
         public final Template.Field<String> namespace = new Template.Field<String>();
+        @Template.Readonly
         public final Template.Field<String> name = new Template.Field<String>();
 
         public final Template.StaticMethod.Converted<MinecraftKeyHandle> createNew = new Template.StaticMethod.Converted<MinecraftKeyHandle>();

src/main/templates/com/bergerkiller/templates/net/minecraft/resources_minecraftkey.txt

@@ -10,14 +10,14 @@ import com.bergerkiller.generated.net.minecraft.core.RegistryMaterialsHandle;
 
 class MinecraftKey {
 #if version >= 1.17
-    protected final String namespace;
-    protected final String name:path;
+    protected final readonly String namespace;
+    protected final readonly String name:path;
 #elseif version >= 1.14.4
-    protected final String namespace;
-    protected final String name:key;
+    protected final readonly String namespace;
+    protected final readonly String name:key;
 #else
-    protected final String namespace:a;
-    protected final String name:b;
+    protected final readonly String namespace:a;
+    protected final readonly String name:b;
 #endif
 
     // Used in generated code. Does not exist on 1.13 and later.