修复imgui cpu占用过高, 升级imgui

imgui_macos_main.mm

@@ -135,6 +135,7 @@ void run_imgui() {
 
             [commandBuffer presentDrawable:drawable];
             [commandBuffer commit];
+            std::this_thread::yield();
         }
     }
     shutdown_imgui();

imgui_windows_main.cpp

@@ -3,6 +3,8 @@
 #include "imgui_impl_win32.h"
 #include <d3d11.h>
 #include <tchar.h>
+#include <thread>
+
 #include "imgui_main.h"
 
 // Data
@@ -141,6 +143,7 @@ void run_imgui() {
         tick_imgui(io.DeltaTime);
         draw_imgui(io.DeltaTime);
         render_imgui();
+        std::this_thread::yield();
     }
     shutdown_imgui();
 }