Telescope pal changes:

Remove libressl from Telescope.
./pal/crypto/openssl/CryptoDigestOpenSSL.cpp

Conform to an uniform interface for Telescope hash computing.
./pal/crypto/CryptoDigest.h
./pal/crypto/openssl/CryptoDigestOpenSSL.cpp

Customize PAL memory allocation.
./pal/crypto/CryptoDigest.h
./pal/system/SleepDisabler.h
./pal/system/SystemSleepListener.h

Migrate webkit 3rd party libraries and WTF to XB1.
./pal/system/win/SoundWin.cpp

Add PlayStation platform version
./pal/PlayStation/LoggingPlayStation.cpp
./pal/system/PlayStation/SoundPlayStation.cpp

Added files:
./pal.vcxproj
./pal.vcxproj.filters
./TELESCOPE.CHANGES.txt (this file)

Add support for Durango XDK
./pal_vs2017.vcxproj
./pal_vs2017.vcxproj.filters