* Put AES ctx on the heap
This forces people to use the ``ctx_release`` functions, because otherwise there will be leaks
* Put fips202 on the heap
* Add much more docs for fips202.h
* fixup! Put fips202 on the heap
* Put SHA2 on the heap-supporting API
* Fix clang-tidy warnings
* Fix unreachable free() in falcon
* Fix McEliece8192128f-sse GNU Makefile
There are schemes, like SABER (#192) that have more than one principal
submitter. Consistency warrants that we turn it into a list for all
schemes and don't do something with allowing either a str or a list:
that would just be very annoying to parse.
Closes#194
