Remove ISR from HamShield, add DDS header.

HamShield.cpp

@@ -1355,10 +1355,10 @@ void HamShield::AFSKOut(char buffer[80]) {
 
 // This is the ADC timer handler. When enabled, we'll see what we're supposed
 // to be reading/handling, and trigger those on the main object.
-ISR(ADC_vect) {
+/*ISR(ADC_vect) {
   TIFR1 = _BV(ICF1); // Clear the timer flag
 
   if(HamShield::sHamShield->afsk.enabled()) {
     HamShield::sHamShield->afsk.timer();
   }
-}
+}*/