v2.1.0

This release adds new functionality to the listen server console command and a client feature (hence the version bump).

Features:

• listen now takes either -s or -c to denote working on the server or client control port. This now allows you to open the server control port on a client.
  E.g

# Open the server listening port on all (*) clients on tcp port 1111
listen -c * --on :1111

This means that new clients can connect to any existing client on port 1111 and be controllable.
Unfortunately clients below v2.1.0 will require just starting a remote forward with regular ssh syntax (-R).

• link now supports --proxy to 'bake' in a proxy address on compilation

Changes:

• Makefile now strips off home path with -trimpath thanks @AdrianVollmer
• The proxy variable can now be baked in to DLLs and regular golang binaries with the RSSH_PROXY variable