Fixed bug with reading file info
Don't return status as Printing if just running a macro
Restored Json buffer back to 2000 bytes so as to return more files on SD
card
Limit the amount of moves we buffer so as to react faster to speed and
extrusion rate changes
Return print time left estimates in M105 S2 status response if printing
a file
Show stepper motor currents as integers and do some rounding to get more
accurate values
