Log Message:
tex-make4ht{,-doc}: update to 0.2f

New filter:
 - joincolors - tex4ht produces an element with unique id for each
   \textcolor and other variants of color commands.
   This filter replaces ids with common name for all elements with
   the same color and removes the duplicated colors from the CSS file.
   This results in substantial file size saving.

Bug fixes:
 - fixed odtimagesize filter
 - fixed $HOME directory lookup on Windows