Log Message:
Update to 2.3
All changes for pthai.el module
- in pthai-play-thaiword, fix logic when sox/play not found
- display duplicate word counts in pthai-unique-word-count
- fix splitting when last character is punctuation and last word is english
- add pthai-say-*-thai-only function to say thai words only buffer/line/region
- add pthai-find-word-regexp to search for words in dictionary/wordlist