Updates many existing emoji, and adds new emoji, including zwj
sequences for blended families. The updated emoji have not been
optimized or resized, run them through the makefile to get ones
similar to the previous existing ones. Not all updated emoji are new
renderings.
The new emoji assets (in sync with Android Lollipop) were slightly
smaller in size. Replacing with a corrected size.
Also update the font version to sync with Android again.
The bitmap emoji tools are extended to create GSUB rules for character
sequences. The images are renamed to code the character sequence in their
filenames. New images are created for ASCII digits and number sign. A new
script is added to add cmaps to the files for backward compatibility.
