Improve Payload Generation

[LewisArdern]

Payload Generation needs to have a few upgrades:

1. We need to display 'raw output of all payloads, not with descriptions
2. Create a HTML display for each payload with a 'copy' feature
3. Maybe the ability when app starts, dump them into payloads.txt
4. Add additional payloads, Mandatory mentioned it was fine to utilise his encoded payloads from xsshunter