Use the correct fonts for BIOS screens.

We should have been using Droid Sans, not Helvetica, and some of the
non-Roman locales need special handling to render clearly and correctly. We
also get better results if we avoid scaling after rendering the text.

Added scripts/newbitmaps/Makefile to regenerate it all, updated the READMEs.
Since Hung-Te figured out how to use pango-view to render the UTF-8
reliably, we don't need to keep all the pre-rendered locale images anymore
either.

This provides the x86 bmpblock for Stumpy PVT. We may need some more
tweaking for Lumpy and/or ARM.

BUG=chrome-os-partner:6595
TEST=manual

Put the new screens into the bios:

  gbb_utility -s --flags=0 -b bmpblock_x86.bin OLDBIOS NEWBIOS
  flashrom -w NEWBIOS

Then reboot and look at the BIOS screens. The lettering is much clearer.

Change-Id: Icb07bc6d131920730f41348c7de9151e42cc9518
Reviewed-on: https://gerrit.chromium.org/gerrit/11007
Tested-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
223 files changed