Merge #85

85: Implement basic Array functionality r=Bromeon a=ttencate

This implements the "easy" stuff on _variant_ arrays:

- `FromIterator`, `From` on slices and Rust arrays
- `IntoIterator`, `try_to_vec`
- basic modification methods
- most utility methods

Still missing:

- utility methods that require `Callable`
- `Eq`, `Ord` (requires generated wrappers for operators)
- everything involving "typed" and "readonly"

See #33

Co-authored-by: Thomas ten Cate <[email protected]>

Author: bors[bot]