update SdFat v2 compatible

- use FatVolume to replace FatFileSystem
- use File32 to replace File

Adafruit_ImageReader.cpp

@@ -214,7 +214,7 @@ void Adafruit_Image::draw(Adafruit_SPITFT &tft, int16_t x, int16_t y) {
              often be in pre-setup() declaration, but DOES need initializing
              before any of the image loading or size functions are called!
 */
-Adafruit_ImageReader::Adafruit_ImageReader(FatFileSystem &fs) { filesys = &fs; }
+Adafruit_ImageReader::Adafruit_ImageReader(FatVolume &fs) { filesys = &fs; }
 
 /*!
     @brief   Destructor.

Adafruit_ImageReader.h

@@ -103,8 +103,8 @@ public:
   void printStatus(ImageReturnCode stat, Stream &stream = Serial);
 
 protected:
-  FatFileSystem *filesys; ///< FAT FileSystem Object
-  File file;              ///< Current Open file
+  FatVolume *filesys; ///< FAT FileSystem Object
+  File32 file;              ///< Current Open file
   ImageReturnCode coreBMP(const char *filename, Adafruit_SPITFT *tft,
                           uint16_t *dest, int16_t x, int16_t y,
                           Adafruit_Image *img, boolean transact);

Adafruit_ImageReader_EPD.cpp

@@ -88,7 +88,7 @@ void Adafruit_Image_EPD::draw(Adafruit_EPD &epd, int16_t x, int16_t y) {
              often be in pre-setup() declaration, but DOES need initializing
              before any of the image loading or size functions are called!
 */
-Adafruit_ImageReader_EPD::Adafruit_ImageReader_EPD(FatFileSystem &fs)
+Adafruit_ImageReader_EPD::Adafruit_ImageReader_EPD(FatVolume &fs)
     : Adafruit_ImageReader(fs) {}
 
 /*!

Adafruit_ImageReader_EPD.h

@@ -44,7 +44,7 @@ protected:
 */
 class Adafruit_ImageReader_EPD : public Adafruit_ImageReader {
 public:
-  Adafruit_ImageReader_EPD(FatFileSystem &fs);
+  Adafruit_ImageReader_EPD(FatVolume &fs);
   ImageReturnCode drawBMP(char *filename, Adafruit_EPD &epd, int16_t x,
                           int16_t y, boolean transact = true);