Adapt to work with picturebox.

Now can decode bitmaps from memory and from FS, can print to screen or a
picture box.
UINT has been changed to DWORD.

UINT has been changed to DWORD because the int variable on 8bit uC is
16bit long.
Added BGR_TO_UINT.
Added function to paint BMP to picture box.
A test bitmap to test the BMP library.
Add definition for 720*480p hdmi.
Change path variable from u char to char.
Add example to paint bitmap.

Example to paint bitmap to picture box from memory or FS (uSD disk 0).