cardano-ledger
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Remove dependency on cardano-prelude (except byron)
This removes the last remaining references to cardano-prelude (excluding byron), namely:
- HeapWords (usage from cardano-prelude replaced with that from cardano-base)
- panic
Because of the depedency on cardano-base, this PR depends on the merging of this one: https://github.com/input-output-hk/cardano-base/pull/280. After the latter is merged, we have to update cabal.project with the corresponding tag and sha256 on this branch, before merging this PR.
closes #1676