Log Message:
Update to version 2.29
- add 'pthai-copy-word-at-point 'pthai-copy-string-at-point
- remove all external-program word splitting functionality associated
  with icu and swath
- for word splitting, use only internal elisp functions
- remove 'pthai-twt-lock, 'pthai-twt-splitter-enable.  this results in
  the 'thai-word-table always being modified when adding or removing words
- rename pthai-splitter-max-recurse-word-length to pthai-rwb-max-word-length
- remove pthai-temperature-* functions