* Refactor read/write hooks
* add PC to the callbacks
* simplify code, merge common code
* remove useless tcg frees
* use tcg_constant_tl as much as possible, removing most #if in libafl code.
* Add cpu_run pre/post exec hooks, to hook the cpu just before / after it runs target code.
* Refactor hooks to separate them in different files
* Remove most extern variables
* Reduce the amount of extra code in QEMU
* Add clang-format script
