Impl `Hash` for `msl::Options` (#716)

* Impl `Hash` for `msl::Options`

* Remove ordered float

* [msl] derive everything on Options manually

* [msl] switch from Arena to Vec for the options

* Fix the clippy error by allowing derive_hash_xor_eq

* Fix skybox test

Co-authored-by: Dzmitry Malyshau <kvarkus@gmail.com>