Talk to a job from python

Very very basic inital checkin to show a way to talk to/from a Vim job
using python (mainly), and to parse the sort of messages that LSP and
VSCode debugger protocol speak (i.e. similar to http messages).

Very hacky, sort of holds together for what it is.

support/bin/testecho

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+
+while true; do
+  read string
+
+  if [ "$string" = "GOODBYE" ]; then
+    exit 0
+  elif [ "$string" = "FAIL" ]; then
+    echo "There was a faytal eyror" >&2
+    exit 1
+  fi
+
+  echo "Content-Type: Something"
+  echo "Content-Length: ${#string}"
+  echo ""
+  echo $string
+
+  string="Special message"
+  echo "Content-Type: Something-else"
+  echo "Content-Length: ${#string}"
+  echo ""
+  echo $string
+done