Array wrappers

[SamTebbs33]

Functions called on arrays should be wrapped to functions in the ash Array class.

So the following code

var array = new [int, 10]
var reversed = array.reverse()
var sorted = array.sort()

Would be converted into

var array = new [int, 10]
var reversed = Array.reverse(array)
var sorted = Array.sort(array)

This requires the implementation of generics (#41), since the Array functions would be generic methods.