FTDI box

This is a box for an FTDI USB-to-serial board. Its looks have been inspired by the [Compact and Secure Orange Pi Zero case](https://www.thingiverse.com/thing:1904872) by [ridercz](https://www.thingiverse.com/ridercz) but it has been created from the ground up. I use this box in my fusebox/meter cupboard for connecting an Orange Pi Zero to the electricity smart meter that has a serial interface for logging the gas and electricity consumption in our house.

The box has two optional screw tabs for mounting it to e.g. a wall.

There are two versions of the bottom: `fdti_bx_bottom1` is the version with the screw tabs on it, `fdti_box_bottom2` is the version without the screw tabs. The `ftdi_box_top` part fits both versions of the bottom. You need only one of either version of the bottom part plus one top part for a complete box.