feat(rife): add support for rife v4.25 & v4.26

[B1ACK917]

As mentioned in #1303 , RIFE has updated lots of model after v4.6, the latest version number is 4.26 now, as v4.2x has been available for over 3 months, I think it's time to add support for the latest model.

The 4.2x model changed the padding factor in the flow, so I add that support in your
librife-ncnn-vulkan first, you can check them in your PR.

The second step is to fit the interface in video2x when calling librife, which is done in this commit.

Later, there needs a submodule update in next commit, which I'll do it asap when you merge the PR in librife.

NOTE:
I have test the linux ver. (compilation and run) on my personal server, however, the building env on windows is too complicated to setup (I don't want to install such huge VS and QT components on my personal computer), so I think there needs a test for windows ver. before you release the feature.

BTW, I really admire your amazing work on this video2x project, thank you.

Contact me at anytime if you need some help on maintaining or got questions on this PR, here's my address fdw22@mails.tsinghua.edu.cn.

Regards,
B1ACK917

[B1ACK917]

Also, I got nearly every model after v4.6 converted to ncnn format, but I didn't add them to this repo due to the huge size, I think it's like hundreds of MB?

Due to the author in Practical-RIFE said "it is recommended to choose 4.25 by default for most scenes", I only added the 4.25 and 4.25-lite, plus the latest 4.26 version.

Please let me know if you want those models to be added, but I don't think it's a good idea to make the repo too huge.

Regards,
B

[k4yt3x]

Amazing! Thanks for the PR. I'll review them ASAP.

I think we can add the models and I'll make some changes to the build scripts to prevent packaging the old models by default. Alternatively, I could host the old models on my file server or something for people that want to try them out to download so we avoid the clutter in the repo.

[k4yt3x]

Btw have you tested processing videos with this model? Does the output look ok?

And don't mind the pipeline errors. I'll do the tests manually. I'll also do the submodule update.