BaseTools: support generating image package from BMP/JPEG/PNG files

BaseTools: support generating image package from BMP/JPEG/PNG files

BaseTools add support to generating image package from BMP/JPEG/PNG
files.
1) New file type *.idf Image definition file to describe HII image
resource. It is the ASCII text file, and includes one or more "#image
IMAGE_ID [TRANSPARENT] ImageFileName".
2) New IMAGE_TOKEN macro is used to refer to IMAGE_ID.
3) New AutoGen header file $(MODULE_NAME)ImgDefs.h to include the
generated ImageId definition.
4) New $(MODULE_NAME)Idf.hpk or $(MODULE_NAME)Images are generated
as the output binary HII image package.

Cc: Liming Gao <liming.gao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Yonghong Zhu <yonghong.zhu@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>