NotReadOnlyReadableComponent (Netty5/Buffer 5.0.0.Alpha3 API)

```
public interface NotReadOnlyReadableComponent
```
Safety by-pass that let us get ByteBuffers from a ReadableComponent that is not read-only.
This is for instance used by the SslHandler, because some SSLEngine implementations cannot unwrap or decode packets from read-only buffers.

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  ByteBuffer mutableReadableBuffer()
  Get a ByteBuffer instance for this memory component.

- Method Detail
  - mutableReadableBuffer
```
ByteBuffer mutableReadableBuffer()
```
    Get a ByteBuffer instance for this memory component.
    Note that unlike the ReadableComponent.readableBuffer() method, the ByteBuffer returned here is writable.
    
    Returns:
    
    A new ByteBuffer, with its own position and limit, for this memory component.