Frontend: Add pause support

src/core/host_interface.h

@@ -31,7 +31,5 @@ public:
 
 protected:
   std::unique_ptr<AudioStream> m_audio_stream;
-
   std::unique_ptr<System> m_system;
-  bool m_running = true;
 };

src/core/settings.h

@@ -11,6 +11,8 @@ struct Settings
 {
   Settings();
 
+  bool start_paused = false;
+
   GPURenderer gpu_renderer = GPURenderer::HardwareOpenGL;
   u32 gpu_resolution_scale = 1;
   u32 max_gpu_resolution_scale = 1;