Add code for switching the speaker respective their amps on or off.

include/config.h

@@ -37,6 +37,8 @@
 #define PIN_VS1053_XDCS    D1
 #define PIN_VS1053_DREQ    D2
 #define PIN_RC522_CS         D0
+#define SPEAKER_L 15
+#define SPEAKER_R 14
 
 #define PIN_BTN_VOL_UP       D4
 #define PIN_BTN_VOL_DOWN     D5

include/player.h

@@ -62,6 +62,8 @@ private:
 	void _unmute();
 	void _sleep();
 	void _wakeup();
+	void _speaker_off();
+	void _speaker_on();
 
 	SPISettings _spi_settings_slow = SPISettings(250000, MSBFIRST, SPI_MODE0);
 	SPISettings _spi_settings_fast = SPISettings(4000000, MSBFIRST, SPI_MODE0);