Disambiguate tone function

The program included a tone function which is also an Arduino built-in function so the compiler threw warnings it didn't know which to use. Changed the local function to fhtone to disambiguate as to which function to use and changed parameters to floats per the function spec.

Author: TheKitty

FunHouse_Arduino_Demos/selftest/selftest.ino

@@ -249,10 +249,10 @@ void loop() {
   /************************** Beep! */
   if (digitalRead(BUTTON_SELECT)) {  
      Serial.println("** Beep! ***");
-     tone(SPEAKER, 988, 100);  // tone1 - B5
-     tone(SPEAKER, 1319, 200); // tone2 - E6
+     fhtone(SPEAKER, 988.0, 100.0);  // tone1 - B5
+     fhtone(SPEAKER, 1319.0, 200.0); // tone2 - E6
      delay(100);
-     //tone(SPEAKER, 2000, 100);
+     //fhtone(SPEAKER, 2000.0, 100.0);
   }
 
   /************************** LEDs */
@@ -270,7 +270,7 @@ void loop() {
 }
 
 
-void tone(uint8_t pin, float frequency, float duration) {
+void fhtone(uint8_t pin, float frequency, float duration) {
   ledcSetup(1, frequency, 8);
   ledcAttachPin(pin, 1);
   ledcWrite(1, 128);