Scriptable TFTP server

This is a TFTP server, designed for use with Installa.

It supports responding to TFTP requests differently depending on client, possibly contacting a database or HTTP server for instructions, and bridging to a HTTP server or a pipe.

Further, it comes with full support for RFC 7440, which can speed up TFTP downloads by an order of magnitude on low-latency gigabit networks, or even more on high-latency links.