CR-10S electronics under-mount

Overview
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The "all-in-one" design posted by Jan_P is pretty good. This is my take.

* This is for the CR-10S. Period. Not the S4, not the S5, not the pro or the pro V2. **CR-10S**
* This design **completely deletes the LCD and control knob** because I have never had to use them. Get yourself a Raspberry Pi and flash an Octopi image to it. There is no need to be messing with SD cards and crappy 40-years-out-of-date LCD interfaces. Turn your printer into a network appliance, you won't regret it!
* The main board is the **Creality 2.0** board
* There is a provision for a Raspberry Pi for those who are running Octoprint
* The feet are the **three mounting hole** type. Many CR-10 variants used four mounting holes. Mine uses three, so I've modified all the 4-hole models to instead use the three M4 flat head cap screws that mine came with.

I have posted ~~7~~ **8** models. 6 of them are copied from Jan_P's thing and revised (revision notes below), one is an unmodified copy (GX-1