* moved globals to afl, shm and fsrv
* moved argv to afl state, less bugs
* fixed unicorn docu
* lists everywhere
* merged custom mutators
* fixed leaks in afl-fuzz
- Remove AFL_PYTHON_ONLY (env) and python_only (variable)
- Unify fuzz API of the custom mutator and Python module
- Merge the custom mutator into the old python_stage, which is now renamed to custom_mutator_stage