Adds implementation of best sample choise.

During implementation of basic algorith there was found couple of issues.
So was added additional criterion.
It's check a length of each phoneme in voice signal.
Voice sighal that has uniform legths of phonemes will be more preority.
Solves some issues with candidate chooser.

* Also add menu item of about.
* Add to TextAnalyzer method for detecting pitch phoneme.
Merge branch 'development' into segmenation-robust