TODO:

add replay flow to proxy
set correct status for each flow in proxy
create 2 cmdline apps (recorder & proxy) - proxy will also replay (depending on session type & cmdline flags)
code stuff:
- move encodings to be on the framebufferupdate message object
- clear all messages read functions from updating stuff, move modification logic to another listener
- message read function should accept only an io.Reader, move read helper logic (readuint8) to an actual helper class