Draft: Use xtensor<char, N> instead of xtensor<int, N>

Maik Nijhuisrequested to merge
ast-1238-use-xtensor-char into master

When XTensor has merged https://github.com/xtensor-stack/xtensor/pull/2708, we can replace the xt::xtensor<int, N> that were added in !1023 (merged) by the smaller xt::xtensor<char, N>.

In the meantime !1484 (merged) updated PreFlagger so it uses uint8_t instead of int. We could consider doing the same in this MR.

Edited by Maik Nijhuis

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