xtouch slim case remix

Remixed case for Geoff Pedder's excellent xtouch slim case. I added a holder for the stylus that is included with the xtouch screen kit. I added a slot for the DS18B20 Temperature Sensor add on wires to exit https://github.com/xperiments-in/xtouch/blob/main/docsI also increased the clearance for the USB slot to make it fit a little easier. NOTE: I have only added the remixed xtouch case to the original 3MF. The print profile is unchanged from Geoff's original and is for PLA, which is perfectly f