[Feature Request] Multisize Support

[YeJY1024]

I have been using the library for a while now and have found it to be incredibly useful. However, when using win2xcur, the library does not handle bigger cursors gracefully.

Only support 128px

For example, the program will only output the input image at its original size, but we often want the program to be automatically compatible with other sizes smaller than that, with simple downsampling.

multisized cursors

It would be incredibly helpful if the library could automatically downsample these bigger images to create smaller cursor types. This feature would not only improve the user experience but also provide more flexibility in customizing the mouse cursor appearance.