Make thermistor tables work on non-AVR.
Remove incomplete At91Sam7s port.
BusyEventLoop: fix compile error if there are no FastEvents.
Add RemoveReference.
Used by upcoming Due port.
PrinterMain: don't hardcode serial buffer sizes
Increase serial receive buffer size to 128 bytes.
The previous value of 64 bytes is a bit too small. It's not even
unreasonable for a single gcode command to be 64 bytes long.
Add RAMPS-FD/Due port.