Cherokee: Adjust base pitch to be higher (seems to effect consonents).

Also removed the pause after each syllable as it no longer seems needed
with the higher base pitch.

Adjusted the tone start/stop values based on Praat pitch analysis
on the newer base pitch.

Add initial support for Pyash languagege, more info:

* https://www.academia.edu/34133204/Pyash_One_Language_to_Unite_Them_All
* https://gitlab.com/liberit/pyac