v1.2.0 Additions

[dicksonlaw583]

• Change xrandom_get_seed to return a clone of the seed by default, so that code like the following works just as it does without the x prefix:

// Remember the seed
var seed = xrandom_get_seed();

/* Some randomization actions here */

// Restore the seed
xrandom_set_seed(seed);

• Use xrandom_get_seed(true) to return the global seed directly (i.e. old default behaviour)
• Change xarray_shuffle to match 2022.11's array_shuffle(array, [offset], [length]) built-in function, returning a shuffled copy of the array or a slice of it. This is a breaking change --- the in-place shuffling behaviour has been moved to xarray_shuffle_ext as per 2022.11 convention.
• Add xarray_shuffle_ext to match 2022.11's array_shuffle_ext(array, [offset], [length]) built-in function. This is where the old xarray_shuffle in-place shuffling behaviour has been moved to.