adds SESSION_TICKET extension id.
adds HAVE_TLS_EXTENSIONS as a dependency to HAVE_SECURE_RENEGOTIATION
reduces tlsx semaphore from 16 to 8 bytes (128 flags to 64 flags).
refactors ConvertExtType() to TLSX_ToSemaphore() for a better name and behavior. Now the overflowing flags are set backwards from the end of the flags to avoid collisions.