Creation of "io_list" file for Ido language

Rules for initial support of Ido language.

According to [1] and [2] , the pronounciation of the pinyin character
h is not accurately [x].
According to [2], [χ] is instead a possible pronounication in young
users.

As a young native speaker of Mandarin, I feel the sound of [χ] in espeak
more satisfied than [x] here.

[1] https://en.wikipedia.org/wiki/Standard_Chinese_phonology
[2] https://phesoca.com/aws/268/

Signed-off-by: Icenowy Zheng <[email protected]>

This item will lead `冉冉` to be pronounced 3 times rather than 2, and
it's not necessary because this character has no overloaded
pronounciation.

Signed-off-by: Icenowy Zheng <[email protected]>

Switch to Portuguese /&~/ for <v>.
Use aveolar /d/ instead of dental /d[/.

The base phonemes file defines alveolar /d/ with the definition for a
dental /d[/ ????

Updates from second zip file, also add missing entry in Makefile.am

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.