Minitronics v1.1

Although we have been shipping the v1.1 for over a week now, I didn't have time to properly announce it. So here it is: our new Minitronics version is available now!

Most important new features are:
- Support for external SD card
- Support for external thermo couple pcb (T3) / or third thermistor if the pullup resistor is soldered.

Also I released a new Marlin package, for both Mini- and Megatronics. The megatronics package fixes some pin definition errors. I will try to clean up the design files and release them later this week.