Fixed a crash when quitting while sounds are still being loaded

Source/Managers/AudioMan.cpp

@@ -130,6 +130,9 @@ bool AudioMan::Initialize() {
 void AudioMan::Destroy() {
 	if (m_AudioEnabled) {
 		StopAll();
+		// FMOD loads sounds on a thread of its own, which crashes if the audio system gets released while it's still at it. That's the case when quitting shortly after launching.
+		// Releasing a sound waits for it to be done loading, and FMOD wants them all released before the audio system anyway.
+		ContentFile::FreeAllLoadedSounds();
 		m_AudioSystem->release();
 		Clear();
 	}

Source/System/ContentFile.cpp

@@ -60,6 +60,15 @@ void ContentFile::FreeAllLoaded() {
 	}
 }
 
+void ContentFile::FreeAllLoadedSounds() {
+	for (const auto& [soundPath, sound]: s_LoadedSamples) {
+		if (sound) {
+			sound->release();
+		}
+	}
+	s_LoadedSamples.clear();
+}
+
 int ContentFile::ReadProperty(const std::string_view& propName, Reader& reader) {
 	StartPropertyList(return Serializable::ReadProperty(propName, reader));
 

Source/System/ContentFile.h

@@ -61,6 +61,9 @@ namespace RTE {
 
 		/// Frees all loaded data used by all ContentFile instances. This should ONLY be done when quitting the app, or after everything else is completely destroyed.
 		static void FreeAllLoaded();
+
+		/// Releases all the sounds loaded by all ContentFile instances, waiting for the ones FMOD is still loading asynchronously. This has to be done before the audio system gets released.
+		static void FreeAllLoadedSounds();
 #pragma endregion
 
 #pragma region Getters and Setters