To create a bitmap for JN_LCD
Jonathan Valvano, 1/24/2018
1) Create a bitmap file.  Since the Nokia 5110 is black and white,
   it will look best to have a white image on a black background.
   Also consider framing the image with a black border of at least
   one pixel on all four sides so the image can be slid without
   smearing.
   4-bit color, 16-color bmp
   width less than or equal to 84 pixels
   height less than or equal 48 pixels
   width must be even
   save the image as a 16-color bmp file
   store in same directory as BmpConvert.exe
2) Execute BmpConvert.exe
   Type the image name 
   E.g., if the file is ti.bmp, then type ti
3) Open the corresponding txt file, select all, copy
4) Open Code Composer Studio compiler
   Paste new image as a data constant
   (Optional) Change "unsigned char" to "uint8_t"
5) If the image is 128x64 pixels, print it in the top left corner with the following:
a) Clear the RAM image buffer
     JN_LCD_ClearBuffer();
b) Put the bitmap in the RAM image buffer
     JN_LCD_PrintBMP(0, 0, ti, 0);
   (Optional) The fourth parameter 0 makes any non-zero pixel 'on'.
   Depending on how colors are used, this might look bad in black
   and white.  Increase this parameter up to 14 to reject more
   colors from turning their corresponding pixels 'on'.
c) Display the RAM image buffer to the entire screen
     JN_LCD_DisplayBuffer();

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