allow mouse unlock via VK_RMENU and VK_RCONTROL

src/main.c

@@ -1098,6 +1098,14 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
                     return 0;
                 }
             }
+            if (wParam == VK_MENU)
+            {
+                if ((GetAsyncKeyState(VK_RMENU) & 0x8000) && GetAsyncKeyState(VK_RCONTROL) & 0x8000)
+                {
+                    mouse_unlock();
+                    return 0;
+                }
+            }
             break;
 
         case WM_KEYUP: