Add support for sound backends & some miniaudio changes (#4978)

Miniaudio now runs everything in a separate audio thread - this uses boost::asio's io_context.
Our miniaudio implementation is now also much simplified - it does not use its own resource manager or device. This might end up being stupid if sounds don't work after changing output device or locking or w/e
I've made the sound controller into an interface, meaning we can support multiple sound backends in Chatterino. I've added a Null sound backend that disables all sound. A QMediaPlayer or QSoundEffect or Qt backend could be added.
Miniaudio might idle & disable the device now too, not sure

I've added some unrelated changes in the form of a new setting type, and a new setting page helper function for it, which will hopefully make adding new enum settings easier in the future.
This setting stores its value as a string instead of an int, and uses magic_enum to convert between that string value and its enum value.

src/Application.cpp

@@ -10,12 +10,14 @@
 #include "controllers/hotkeys/HotkeyController.hpp"
 #include "controllers/ignores/IgnoreController.hpp"
 #include "controllers/notifications/NotificationController.hpp"
+#include "controllers/sound/ISoundController.hpp"
 #include "providers/seventv/SeventvAPI.hpp"
 #include "singletons/ImageUploader.hpp"
 #ifdef CHATTERINO_HAVE_PLUGINS
 #    include "controllers/plugins/PluginController.hpp"
 #endif
-#include "controllers/sound/SoundController.hpp"
+#include "controllers/sound/MiniaudioBackend.hpp"
+#include "controllers/sound/NullBackend.hpp"
 #include "controllers/twitch/LiveController.hpp"
 #include "controllers/userdata/UserDataController.hpp"
 #include "debug/AssertInGuiThread.hpp"
@@ -57,6 +59,34 @@
 
 #include <atomic>
 
+namespace {
+
+using namespace chatterino;
+
+ISoundController *makeSoundController(Settings &settings)
+{
+    SoundBackend soundBackend = settings.soundBackend;
+    switch (soundBackend)
+    {
+        case SoundBackend::Miniaudio: {
+            return new MiniaudioBackend();
+        }
+        break;
+
+        case SoundBackend::Null: {
+            return new NullBackend();
+        }
+        break;
+
+        default: {
+            return new MiniaudioBackend();
+        }
+        break;
+    }
+}
+
+}  // namespace
+
 namespace chatterino {
 
 static std::atomic<bool> isAppInitialized{false};
@@ -92,7 +122,7 @@ Application::Application(Settings &_settings, Paths &_paths)
     , ffzBadges(&this->emplace<FfzBadges>())
     , seventvBadges(&this->emplace<SeventvBadges>())
     , userData(&this->emplace<UserDataController>())
-    , sound(&this->emplace<SoundController>())
+    , sound(&this->emplace<ISoundController>(makeSoundController(_settings)))
     , twitchLiveController(&this->emplace<TwitchLiveController>())
 #ifdef CHATTERINO_HAVE_PLUGINS
     , plugins(&this->emplace<PluginController>())
@@ -260,6 +290,11 @@ IUserDataController *Application::getUserData()
     return this->userData;
 }
 
+ISoundController *Application::getSound()
+{
+    return this->sound;
+}
+
 ITwitchLiveController *Application::getTwitchLiveController()
 {
     return this->twitchLiveController;