fix single characters transcription for б, ж, й, ў

fix single characters transcription for б, ж, й, ў

- fix IPA chars for "s;" and "z;" phonemes
- add bug note about "...i a..." case

- fix IPA chars for "s;" and "z;" phonemes
- add bug note about "...i a..." case

Fixes: #1547

- Implement building and testing with cmake
- Download libsonic from repository (when enabled and not available as
system library), ref: #650
- Migrate android native build to cmake
- Migrate CI to cmake
- Add windows CI

TODO (might be done in separate PR):
- Building as [cmake external
project](https://cmake.org/cmake/help/latest/module/ExternalProject.html)
- Building for package managers (deb, rpm, ...)
- Strip out `vcproj` - _to be discussed_
- Strip out `autotools` after next release
- Update build documentation for `cmake`

Fixes: #1549

A bunch of `#ifdef` stuff cleanups, including:

- Check header presence with `__has_include` instead of autoconf's
`HAVE_XXX` macro
- Standartization of defines: consistent naming, define to 1 and check
with `#if` instead of `#ifdef`
- Compile MBROLA-related code only if configured `--with-mbrola`
- Compile tests with flags that match configuration (including async,
klatt, speechplayer, mbrola)
- Fix for API test when compiled with async

ref: #1554
ref for buffer size:
a6fb239208/source/synthDrivers/_espeak.py (L338)

ref: #1554
ref for buffer size: a6fb239208/source/synthDrivers/_espeak.py (L338)

Ref: #1549

Contribute to #68 

Reduce number of externs and static-returns