Add option to write payloads to file

[JJK96]

What does it implement/fix? Explain your changes.

It adds a parameter --write-payloads PAYLOADS_FILE which writes the payloads generated by scan to the given file. This is useful in order to run the payloads with another tool or to examine and edit them before executing.

Where has this been tested?

Python Version: Python 3.9.5
Operating System: Mac OS

ProductName:	macOS
ProductVersion:	11.4
BuildVersion:	20F71

Does this close any currently open issues?

No

Does this add any new dependency?

No

Does this add any new command line switch/option?

Yes

Any other comments you would like to make?

Some Questions

• I have documented my code.
  • I think the changes are quite clear in itself.
• I have tested my build before submitting the pull request.

[ItsIgnacioPortal]

Since @s0md3v seems to have abandoned this project, I've gone ahead and took the liberty to make a fork: XSStrike-Reborn
Your pull request has been merged into that project. Your efforts are appreciated 😁