#80 NativeArray: fix moveTo, moveFrom if other array has different type

At this moment moveTo/moveFrom assumes that second array has identical type. If second array has different, even assign-compatible type, exception will be thrown because we will try to convert at array level.

It should be implemented in this way, that current implementation runs for identical types, and unoptimized version (which uses get/set) is returned in other cases.

The same applies to all comparators

comparators use cast at object level:

public IntComparator comparator(NativeArray values) {
    DoubleArray that = (DoubleArray)values;
    return (a,b) -> Double.compare(this.array[a], that.array[b]);
}

it can be transformed to:

public IntComparator comparator(NativeArray values) {
    double[] other = values.$array();
    return (a,b) -> Double.compare(this.array[a], other[b]);
}

That version of optimized operation will avoid accessing field over and over again.