Add Random.list simplifications

[lue-bird]

Random.list 0 generator
--> Random.constant []

-- not part of the summary
Random.list -1/-2/-3/... generator
--> Random.constant []

Random.list 1 generator
--> Random.map List.singleton generator

Random.list n (Random.constant el)
--> Random.constant (List.repeat n el)

part of #109

[lue-bird]

The last 2 commits are unrelated. They only correct the normalization test "should normalize an operator application" with the new elm-syntax upgrade so that the CI and the local setup are happy