v0.3.2504

Added disablePwmPin().

• Calls digitalWrite() to call core function turnOffPWM()
• Extra code for ATmega328P/168 to implement turning PWM off on toggle-only pins
• Extra code for LGT8F328P to PWM off toggle-only pins and switch Timer3 pins back from port F to port D (which share pins on SSOP20 and FPQ32)

ATtiny's and ATmega8A were not tested yet, so no special code for toggle pins on those.