codecrypt is usually invoked only with one prepare() and decrypt(), so
this basically saves several megs of memory and cuts needed computation
time in half.
- removed cfs_qd (I didn't find a workable specification and it's still
slow&ugly)
- removed mce_oc (it's just insecure and no one will use that)
- removed library structure, it isn't neccesary anyway
- added primitives for hashing to prepare for FMTseq