This pull request adds a few new features that I believe are going to help the community update their older packs to 1.13+ (as it hasn't changed anything in 1.14+ as of yet)

I added a system that updates models in all folders that are in the models folder, regardless of name (was an issue with packs that use custom models)

I also added the ability to convert entity textures (this was not the case with your original converter)

With a few of these changes, I had tested this and it seems that issue #10 is fixed. I downloaded gnembom's pack and updated it with the latest version of my fork. Seems to be without a majority of issues. I still plan on working on this, but i figured it would be easier for the community to see a software like this work in the best way possible, from the best known source. Thank you.
Agentdid127

PS I had modified a few things with the settings in my fork. feel free to change them as you see fit if you decide to merge