soft `з, с` if previous syllable is soft

fix "здж" > "ждж" rule, fix test for it
add rules for "б г д дз дж з" at the end of words
add devoiced rules conversion
add some words to vocabulary
added tests for new rules

nvda happened to be speaking 3647 because strtoi was actually
overflowing. Better make sure to have proper ascii to number translation
before continuing.

Fixes #1385

cover all phoneme rules with
the tests.

added tests to:
- language-numbers-cardinal.test
- tests/language-phonemes.test
- tests/language-pronunciation.test

./src/espeak-ng -v ar --path=$PWD 5777

would access out of the vowel_stress array, because GetVowelStress, in the
phcode == phonSYLLABIC case, only increments count if stress is 0.  This
code seems fishy, and is not coherent with the loop in SetWordStress.  I
made it similar to the other case above, thus fixing the out-of-bound
access.

This is modifiying the stress in the tn test, I don't know whether this
is expected.

Ref #1271

* Add: fuzzer files and modifications in config & compil
* add configure.ac change
* add minimize-corpus.sh
* add fuzzing directory and readme
* add to check if CC support libfuzzer
* Make workflow dump the crash POC
* Add debugging information
* Run fuzzing only once a week for now

Co-authored-by: kmamadoudram <[email protected]>
Co-authored-by: yocvito <[email protected]>
Co-authored-by: Samuel Thibault <[email protected]>

This commit implements support for [Totontepec Mixe](https://en.wikipedia.org/wiki/Totontepec_Mixe). The Espeak rules are based on the phonological inventory, orthographic mappings, and phonetic processes described in the "Esbozo fonológico" (phonological outline/sketch) chapter of Verónica Guzmán Guzmán's 2012 master's thesis in Indo American Linguistics awarded by the [Centro de Investigaciones y Estudios Superiores en Antropología Social](https://ciesas.edu.mx/) and *Vocabulario Mixe de Totontepec* (Totontepec Mixe vocabulary), compiled by Alvin Schoenhals and Louise C. Schoenhals and published by the Summer Institute of Linguistics in 1965.

This commit was developed as part of a project for [Computational Linguistics](https://jnw.domains.swarthmore.edu/ling073/syllabus.php) at [Swarthmore College](https://swarthmore.edu). We feel that this language is suitable for merge with "testing" status, but further verification/improvements by native speakers would be very helpful.

co-authored-by: Elizabeth Resendiz <[email protected]>