Add array integration to Value and Elements

E.g.

```
* toByteArray
* toShortArray
* toIntArray
* toLongArray
* toFloatArray
* toDoubleArray
```

```
* fromByteArray
* fromShortArray
* fromIntArray
* fromLongArray
* fromFloatArray
* fromDoubleArray
```

* Support for unsigned?
* Support for Bits Allocated, High Bit, Pixel Representation etc?