Raspberry Pi Zero Stem Case v2.1

Following on from our [Raspberry Pi Zero / Zero W Stem Case](https://www.thingiverse.com/thing:2488949) we've created a new version with many improvements.

This is a case for the Raspberry Pi Zero/Zero W with the "Stem" by [zerostem.io](http://zerostem.io) - a PCB shim that turns it into a dongle.

The enclosure has been redesigned to be a much better, all around enclosure with two interlocking parts, rather than a box with a simple lid.
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The case is now 2mm shorter allowing for a much better fit for the Pi Zero with Stem.
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There are two bases and four top sections allowing for options to access the HDMI and USB ports and/or the header or completely enclosed.
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All versions of the case leave just enough access to the micro SD card for a pair of tweezers or small pliers
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The USB port for power is intentionally enclosed as it's redundant with the Zero Stem and should not be used.
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The case is still designed to be glued together as there is insuficient room to create re