message: Added a clear function for purging all data that is holded by the FlatBuffer.
diff: @@ -106,6 +106,22 @@ public class FlatBufferBuilder {
  return this;
  }
  + /**
  + * Reset the FlatBufferBuilder by purging all data that it holds.
  + */
  + public void clear(){
  + space = bb.capacity();
  + bb.clear();
  + minalign = 1;
  + while(vtable_in_use > 0) vtable[--vtable_in_use] = 0;
  + vtable_in_use = 0;
  + nested = false;
  + finished = false;
  + object_start = 0;
  + num_vtables = 0;
  + vector_num_elems = 0;
  + }
  +
  /// @cond FLATBUFFERS_INTERNAL
  /**
  * Create a `ByteBuffer` with a given capacity.
  