Prepend I2CDFPlayer with DF_ to solve Nucleo RESET directive

Prepend all I2CDFPlayer EXRail commands with DF_ to solve a Nucleo defined RESET

EXRAIL2.h

@@ -260,21 +260,21 @@ private:
 
 // IO_I2CDFPlayer commands and values
 enum  : uint8_t{
-    PLAY          = 0x0F,
-    VOL           = 0x06,
-    FOLDER        = 0x2B, // Not a DFPlayer command, used to set folder nr where audio file is
-    REPEATPLAY    = 0x08,
-    STOPPLAY      = 0x16,
-    EQ            = 0x07, // Set equaliser, require parameter NORMAL, POP, ROCK, JAZZ, CLASSIC or BASS
-    RESET         = 0x0C,
-    DACON         = 0x1A,
-    SETAM         = 0x2A, // Set audio mixer 1 or 2 for this DFPLayer (future use)   
-    NORMAL        = 0x00, // Equalizer parameters
-    POP           = 0x01,
-    ROCK          = 0x02,
-    JAZZ          = 0x03,
-    CLASSIC       = 0x04,
-    BASS          = 0x05,    
+    DF_PLAY          = 0x0F,
+    DF_VOL           = 0x06,
+    DF_FOLDER        = 0x2B, // Not a DFPlayer command, used to set folder nr where audio file is
+    DF_REPEATPLAY    = 0x08,
+    DF_STOPPLAY      = 0x16,
+    DF_EQ            = 0x07, // Set equaliser, require parameter NORMAL, POP, ROCK, JAZZ, CLASSIC or BASS
+    DF_RESET         = 0x0C,
+    DF_DACON         = 0x1A,
+    DF_SETAM         = 0x2A, // Set audio mixer 1 or 2 for this DFPLayer   
+    DF_NORMAL        = 0x00, // Equalizer parameters
+    DF_POP           = 0x01,
+    DF_ROCK          = 0x02,
+    DF_JAZZ          = 0x03,
+    DF_CLASSIC       = 0x04,
+    DF_BASS          = 0x05,
   };
 
 #endif