Multithreaded implementation added to SDL_mixer backend #39
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Added a optional multithreaded implementation to the SDL_mixer backend.
This reduces the latency between playing two sound buffers by computing the next buffer as the current buffer is playing.
The new multithreaded implementation is enabled by default for native applications but
the old singlethreaded implementation can be forced by defining
SOUNDWAVE_USING_SDLMIXER_SINGLETHREADand is used in emscripten by default.To enable the multithreaded implementation in emscripten aswell, provide the
-pthreadduring compilation and linking (https://emscripten.org/docs/porting/pthreads.html).