Fix gadget check and add gadget type.
Fix gadget check and add gadget type.

Done:
    1.  speed and fix gadget check function(Gadget.py)
    2.  add SEH type for gadget type if doesn't need bypass DEP(pop/pop/ret) (Gadget.py).
TODO:
    1. design a algorithm to auto generate ROP chain to close DEP(by VirtualProtect() ,trick pushad + jmp esp to run shellcode).
    2. add pydbg to gadget stackpivot
    3. restore gadget in a file.
b09780978/SEH_Fuzzer