Add post-exploitation module to get FW filtering rules
Ports default values added, is_internal REX function added, reference added
Do minor cleanup
Merge pull request #6 from jvazquez-r7/review_4187

Do minor cosmetic cleanup for post-exploitation module to get FW filtering rules
session.tunnel_peer changed by session.session_host. Other minor changes
Rex::Socket.to_sockaddr changed
Rex::Socket.to_sockaddr changed
Use DNS names
Fix DYNAMIC_BASE templates
Support 32 and 64-bit for exe-only, and fix -k
Document method

Fix #4366 (support dynamic_base templates)
recvfrom allocation changed
Show message at the end
Fix #4430 - Add support for -o to save the payload to disk

Fix #4430
No point to save if there's no payload
Well, should be -1
Land #4437, msfvenoms new output switch
Correct Microsoft security bulletin for ppr_flatten_rec
Land #4450, MSB reference fix
Add stager for hidden bind shell payload