Telescope harfbuzz changes:

Using haffbuzz + icu + fontconfig + freetype.
./src/harfbuzz.cc
./src/hb-common.h

Supporting new platforms.
./src/hb-common.cc
./src/hb-mutex.hh
./src/hb-shaper.cc

Using customized memory allocation.
./src/hb.hh

Added files:
./harfbuzz.vcxproj.filter
./harfbuzz.vcxproj
./TELESCOPE.CHANGES.txt (this file)
./telescope.harfbuzz.props
