Local gateway / SOCKS5 in Golang

[liamzebedee]

This improves the performance of Dappnet, namely:

• rewrite of the v1 local-gateway and socks5-proxy from JS into Go
• much better parallelization/performance:
  • 1 - the socks5 proxy was probably broken in some way. it had a memory leak, and generally wasn't robust code. this caused some issues with loading multiple sites at once.
  • 2 - golang is generally faster than JS, it's compiled to machine code (arm/amd64), and qualitatively I found it easier to build HTTP servers with with more robust logic around handling bytes.