DIgiUSB: enable usbSofCount thingy
DigiUSB: stop messing with tone generator, and added DigiUSB.delay() function to delay for a number of milliseconds without ignoring the USB host
tone library interrupt vector not blocking, so it doesn't fight with USB and crash the USB library.
digispark tiny core: modded wiring.c timer stuff to be more accurate on tiny85's running at different clock speeds (including 16.5mhz!!!)