Jivarofad/m2560 update (#4593)

* New drivers : buzzer/speaker, voice wtv20 / jq6500 , i2c

First commit, testings to be done

* Voice correction

* Better way to drive voice modules

Same thing as LCD drivers

* Issue #2337 (error mismatch) solved

* Font correction

* Fonts correction again

* oups...

* Voice modules (Companion) & flash saving (ST7920)

* Documentation update

* I2C driver correction

* Mega2560 directory renamed to mega2560

* M2560 driver correction

* Voice directory correction

* Voice=ON does not works with MEGA2560 (OFF/WTV20/JQ6500)

* Compliant to cmake documentation

* On M2560, audioAVR use playnumber et playduration declared in voice.h
Don't know why, must be discuted...

* ‘{’ token forgotten

* Simplier way for AVR voice

radio/src/audio_avr.cpp

@@ -283,7 +283,7 @@ void audioTimerCountdown(uint8_t timer, int value)
     // pass
   }
 
-#if defined(CPUM2560)
+#if defined(CPUM2560) && (defined(VOICE_WTV20) || defined(VOICE_JQ6500))
   else if (g_model.timers[timer].countdownBeep == COUNTDOWN_VOICE) {
     if (value >= 0 && value <= TIMER_COUNTDOWN_START(timer)) {
       playNumber(value, 0, 0);