Added timeout to output buffers destined for USB
Fixed bugs in thermocouple code
Reallocated thermocouple pin numbers
Made Roland mill and inkjet support conditional and normally disabled
Fixed issue with thermocouple code messing up the timekeeping system,
which was suspected of causing the network to be unreliable
Added support for M577 (thanks chrishamm)
Merged in chrishamm's changes including OutputBuffer fix, changes to
Roland pin numbers, rr_configfile support in web server, and Roland and
inkjet pin numbers moved to Pins_duet.h
Merged in wrangellboy's http response changes for compatibility with
Edge browser
Other minor changes
