Streaming audio files

[ghost]

To think about:

• smarter use of mutexes
• testing with thread sanitizer
• OpenAL issue:

OpenAL error at ../rwengine/src/audio/SoundBufferStreamed.cpp:22: Invalid value!
OpenAL error at ../rwengine/src/audio/SoundBufferStreamed.cpp:23: Invalid operation!

[codecov]

Codecov Report

Merging #706 into master will increase coverage by 0.02%.
The diff coverage is 20.93%.

@@            Coverage Diff             @@
##           master     #706      +/-   ##
==========================================
+ Coverage   18.05%   18.08%   +0.02%     
==========================================
  Files         248      249       +1     
  Lines       22746    22861     +115     
  Branches     5752     5810      +58     
==========================================
+ Hits         4107     4134      +27     
- Misses      17540    17607      +67     
- Partials     1099     1120      +21

Impacted Files	Coverage Δ
rwengine/src/audio/Sound.hpp	0% <ø> (-25%)	⬇️
rwengine/src/audio/SoundSource.hpp	0% <ø> (ø)	⬆️
rwengine/src/audio/SoundBuffer.cpp	48.38% <0%> (-0.77%)	⬇️
rwengine/src/audio/SoundSource.cpp	5.74% <0%> (+0.34%)	⬆️
rwengine/src/audio/Sound.cpp	48.64% <60%> (+1.77%)	⬆️
rwengine/src/audio/SoundManager.cpp	26.8% <64.7%> (+0.11%)	⬆️
tests/test_AudioLoading.cpp	59.37% <66.66%> (+1.31%)	⬆️
rwengine/src/audio/SoundBufferStreamed.cpp	9.57% <9.57%> (ø)
rwengine/src/objects/InstanceObject.cpp	7.73% <0%> (-0.12%)	⬇️
rwengine/src/objects/VehicleObject.cpp	11.47% <0%> (-0.12%)	⬇️
... and 30 more

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