FT-242 Remove fttypes.h
FT-296 Move bytestring code to its own header in utils/
Clean up ydb/ includes, some aesthetic changes to ft-internal.h
Break up ft-internal.h by factoring out serialization code
Move misplaced things out of ft.h
Remove tokuconst.h, clean up xids a bit
Clean up xids a lot more
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, some cleanup
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