Telescope harfbuzz changes:

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

Use pthread for sony platform.
./src/hb-mutex.hh

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

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

Supporting Durango XDK:
./harfbuzz_vs2017.vcxproj.filter
./harfbuzz_vs2017.vcxproj
./src/hb.hh
