Renderer: Use imgui for drawing debug text and OSD

Source/Core/VideoBackends/Software/SWRenderer.cpp

@@ -97,13 +97,8 @@ std::unique_ptr<AbstractPipeline> SWRenderer::CreatePipeline(const AbstractPipel
 // Called on the GPU thread
 void SWRenderer::SwapImpl(AbstractTexture* texture, const EFBRectangle& xfb_region, u64 ticks)
 {
-  OSD::DoCallbacks(OSD::CallbackType::OnFrame);
-
   if (!IsHeadless())
-  {
-    DrawDebugText();
     m_window->ShowImage(texture, xfb_region);
-  }
 
   UpdateActiveConfig();
 }