Added generation of typed helpers when using nested_flatbuffers in Java/C#. Fixes #3500

diff --git a/tests/MyGame/Example/Monster.cs b/tests/MyGame/Example/Monster.cs
index b324a8d..e456db8 100644
--- a/tests/MyGame/Example/Monster.cs
+++ b/tests/MyGame/Example/Monster.cs

@@ -45,6 +45,8 @@
   public byte GetTestnestedflatbuffer(int j) { int o = __offset(30); return o != 0 ? bb.Get(__vector(o) + j * 1) : (byte)0; }
   public int TestnestedflatbufferLength { get { int o = __offset(30); return o != 0 ? __vector_len(o) : 0; } }
   public ArraySegment<byte>? GetTestnestedflatbufferBytes() { return __vector_as_arraysegment(30); }
+  public Monster TestnestedflatbufferAsMonster() { return GetTestnestedflatbufferAsMonster(new Monster()); }
+  public Monster GetTestnestedflatbufferAsMonster(Monster obj) { int o = __offset(30); return o != 0 ? obj.__init(__indirect(__vector(o)), bb) : null; }
   public bool MutateTestnestedflatbuffer(int j, byte testnestedflatbuffer) { int o = __offset(30); if (o != 0) { bb.Put(__vector(o) + j * 1, testnestedflatbuffer); return true; } else { return false; } }
   public Stat Testempty { get { return GetTestempty(new Stat()); } }
   public Stat GetTestempty(Stat obj) { int o = __offset(32); return o != 0 ? obj.__init(__indirect(o + bb_pos), bb) : null; }

diff --git a/tests/MyGame/Example/Monster.java b/tests/MyGame/Example/Monster.java
index 669bed9..16c7386 100644
--- a/tests/MyGame/Example/Monster.java
+++ b/tests/MyGame/Example/Monster.java

@@ -51,6 +51,8 @@
   public int testnestedflatbuffer(int j) { int o = __offset(30); return o != 0 ? bb.get(__vector(o) + j * 1) & 0xFF : 0; }
   public int testnestedflatbufferLength() { int o = __offset(30); return o != 0 ? __vector_len(o) : 0; }
   public ByteBuffer testnestedflatbufferAsByteBuffer() { return __vector_as_bytebuffer(30, 1); }
+  public Monster testnestedflatbufferAsMonster() { return testnestedflatbufferAsMonster(new Monster()); }
+  public Monster testnestedflatbufferAsMonster(Monster obj) { int o = __offset(30); return o != 0 ? obj.__init(__indirect(__vector(o)), bb) : null; }
   public boolean mutateTestnestedflatbuffer(int j, int testnestedflatbuffer) { int o = __offset(30); if (o != 0) { bb.put(__vector(o) + j * 1, (byte)testnestedflatbuffer); return true; } else { return false; } }
   public Stat testempty() { return testempty(new Stat()); }
   public Stat testempty(Stat obj) { int o = __offset(32); return o != 0 ? obj.__init(__indirect(o + bb_pos), bb) : null; }