Due to `utils` module removal, `EXTERNAL_CONFIG_FLAGS` was not working, so the system was redesigned.
This change is independent of #4411

[utils] was created long time ago, when [rcore] contained all the platforms code, the purpose of the file was exposing basic filesystem functionality across modules and also logging mechanism but many things have changed since then and there is no need to keep using this module.

 - Logging system has been move to [rcore] module and macros are exposed through `config.h` to other modules
 - File system functionality has also been centralized in [rcore] module that along the years it was already adding more and more file-system functions, now they are all in the same module
 - Android specific code has been moved to `rcore_android.c`, it had no sense to have specific platform code in `utils`, [rcore] is responsible of all platform code.

- REVIEWED: Checking `NULL` input on functions getting `const char *text`, to avoid crashes
- REVIEWED: `strcpy()` usage, prioritize `strncpy()` with limited copy to buffer size
- REPLACED: `strlen()` by `TextLength()` on [rtext] module
- REVIEWED: Replaced some early returns (but keeping others, for easier code following)

Now it goes from -1.0 (full left) to 1.0 (full right) being 0.0 center

* Get C++ compilers working

* Fix Formatting

Fix  raysan5/raylib#5131.

Allow for the use of raudio stand alone

In the case of a failure within miniaudio on the function: ma_convert_frames, the dynamic memory allocated for the `data` variable  will leak on the early return.

Force conversion to 16-bit, same as how it is done in `LoadMusicStream`.
This fixes the problem where 24-bit FLACs play silence or broken sound.

Co-authored-by: Listeria monocytogenes <listeria@disroot.org>

Similarly to how it's done for WAV format, by forcing the conversion
to s16 on UpdateMusicStream().

also allow `finalFrame = wave->frameCount' as the range of frames does
not include it.

Co-authored-by: Listeria monocytogenes <listeria@disroot.org>

Co-authored-by: Listeria monocytogenes <listeria@disroot.org>

* Fixes for loading Music

Fix for #3889
Fixes for QOA crashes.
Memory leak FIX on unsuccessful .wav loading.

* Added comments

* Flip release of buffer;

First it needs to be taken out of the processing chain, then it can be released. The inverse of the initialization.

* Add mutex locks to audio buffer functions; Separate those used from both threads

* Flip release of buffer;

First it needs to be taken out of the processing chain, then it can be released. The inverse of the initialization.

* Remove TODO marker; The buffer is in stopped state and its data won't be accessed

* Add mutex locks to music/stream functions directly operating on buffer

* Secure UpdateMusicStream/PlayMusicStream/UpdateAudioStream;

This change is twofold:
* Add locks to UpdateMusicStream/UpdateAudioStream (second one needed separation)
* Remove unnecessary hack to restart music - inlining the statements resulted in a no-op

Especially the second part made it easier to ensure thread-safety overall

* Remove redundant check; Already checked at beginning of function