Added fuzzer tests (#500)

* Added fuzzer for tbls routine
* Added fuzzers to some sign packages
* Update README.md
Add a more prominent disclaimer about target audience of this library.

* Added fuzzers to some sign packages
* Used deterministic streams in fuzzers
* Some refactoring
* Add test wrong shuffles on pair
* Add test wrong Shuffle Sequence
* Add negative test for shuffle/Biffle
* Reduce code duplication
* Added determinist stream to suite

---------

Co-authored-by: Linus Gasser <linus.gasser@epfl.ch>
Co-authored-by: lauener <kilian.lauener@epfl.ch>
Co-authored-by: Yolan Romailler <AnomalRoil@users.noreply.github.com>

Makefile

@@ -24,4 +24,4 @@ coverage: tidy
 # target to run all the possible checks; it's a good habit to run it before
 # pushing code
 check: lint vet test
-	echo "check done"
+	echo "check done"