FT-242 Break up fttypes.h completely.
FT-296 Move bytestring class to utils/
FT-298 Start breaking up ft-internal.h by moving serialization code to
its own header
FT-299 Clean up XIDs abstraction
FT-294 Move serialization code to its own subdirectory, serialize/
FT-294 Move the logging code to its own sudbdirectory, logger/
FT-294 Move cachetable files to ft/cachetable, txn files to ft/txn
FT-295 Move ybt.h to utils/dbt.h
FT-297 Move tools to tools/
FT-293 Remove examples/, which hasn't been built or maintained in years
FT-292 Fix leak in comparator-test
FT-291 Remove the remaining cilk artifacts