Add decode_jwt script, install kubeswitch on linux, unfreeze firefox version on linux, disable more bits of currentznver4 FreeBSD build, install terminfo-db, and remove build configs from old version of poudboot.

ansible/roles/base/files/decode_jwt.bash

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+#
+# Decode the contents of a JWT
+set -euo pipefail
+IFS=$'\n\t'
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+
+exec jq -R 'split(".") | .[0],.[1] | @base64d | fromjson'