SOCKS5 Proxy Changer per vlad-sharpie

Make sure to allow the extension to run in private windows, it will not work otherwise.

All this does is rotate through a pre-defined list of UK Mullvad servers hosting a SOCKS5 proxy, a few times I have seen sites like Reddit blocking access because of VPN usage, but changing the proxy server has always worked to bypass this.

Improvements to be made:

• Make it work with more locations - I have no use for this currently, but happy to accept PR's.
• Add a button to exclude the currently open site from being proxied - This would be helpful but it's rare enough where it's not a pain to add the exclusion manually.