Override `.slice` in ArrayOps to use arraycopy.

This makes it ~10x faster when copying large chunks arround.
My benchmark:

def bm(duration: Long)(f: => Unit): Int = {
val end = System.currentTimeMillis + duration
var count = 0
while(System.currentTimeMillis < end) {
f
count += 1
}
count
}

def measure(seconds: Int)(f: => Unit) = (1 to seconds).map { _ => bm(1000)(f) }.sum / seconds

val array = scala.util.Random.alphanumeric.take(1000).toArray

measure(20) { array.slice(100, 500) }
// ~5 million
measure(20) { scala.collection.WrappedArray(array).slice(100, 500) }
// ~300K

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