Added strip length adjustment via serial and wifi. Working toward "no compile" required for any setup.

- fixed bug in settings when initial read failed. It was
   trying to
turn off the sound timer while it was still NULL
 - Number of LEDs is
now adjustable via serial and wifi. Woot, no
   recompile just to
change strip length.
 - A little refactoring so Wifi and Serial
interfaces can share
   some code.
 - Added Refresh button to web page

sound.h

@@ -58,12 +58,14 @@ void sound_init(int pin){  // pin must be a DAC pin number !! (typically 25 or 2
 
 void sound_pause() // this prevents the interrupt from firing ... use during eeprom write
 {
-	timerStop(sndTimer);	
+	if (sndTimer != NULL)
+		timerStop(sndTimer);	
 }
 
 void sound_resume() // resume from pause ... after eeprom write
 {
-	timerRestart(sndTimer);
+	if (sndTimer != NULL)
+		timerRestart(sndTimer);
 }
 
 bool sound(uint16_t freq, uint8_t volume){