use ZDDs as an alternative to BDDs with CUDD

[m4lvin]

The goal of this PR is to include the work by @dushiel done as part of the master thesis Zero-suppression Decision Diagrams versus Binary Decision Diagrams on Dynamic Epistemic Logic Model Checking into SMCDEL proper.

Note: the cli and web executables are not affected by this, they still only use CacBDD.

ToDo

• [x] fix bug in https://github.com/dushiel/SMCDEL/pull/27/commits/fe2ea1cf35ba9533c66aeb1c27d72612bed54a50 stack bench smcdel:bench:bench-muddychildren --benchmark-arguments "CUDD/3" failed, also with 4, but not with 15 or 20. All of them needed way too much RAM.
• [x] add statesOf
• [x] change comments to haddock syntax
• [x] merge all CUDD tests into one file
• [x] provide enough tests, check coverage
• [x] check that all old tests still compile and run
• [x] check that old benchmarks still compile and run

NotDo / later

• dynamic operators
• add ZDD variants to muddychildren benchmark
• provide allSat etc for BDD flipped variants (or even for ZDDs)

[dushiel]

• [x] restrictLaw passes tests
• [x] use renameMyGraph2 xDotGraph myShow in S5_CUDD
• [x] implement cleanupObsLaw in Ki_CUDD
• [x] make testable (K_ / Ki_CUDD): instance update, forall/exists, knowledge operators