Support progress display and a cache question

[YohoYang]

VapourSynth-RealSR-ncnn-Vulkan is great.

Hope to show progress as it is processed.

One problem is that if the path contains Chinese, the following error will be prompted, maybe the path does not support UTF-8?

Python exception: RealSR: can't open model file

Traceback (most recent call last):
  File "src\cython\vapoursynth.pyx", line 2832, in vapoursynth._vpy_evaluate
  File "src\cython\vapoursynth.pyx", line 2833, in vapoursynth._vpy_evaluate
  File "D:\CONAN\OUT\TEST\OVA7.vpy", line 15, in <module>
    video = core.rsnv.RealSR(video, tilesize_x=300, tilesize_y=300, gpu_thread=2)
  File "src\cython\vapoursynth.pyx", line 2580, in vapoursynth.Function.__call__
vapoursynth.Error: RealSR: can't open model file

By the way, are there caches generated during processing, and where are they all stored?