Some minor changes.

### The changes

The changes are:
   * No more missing/not working textures due to outdated animation files.
        With the new resourcepacks instead of texturepacks Mojang changed the way to configure the animation of textures. Now you need to write a simple JSON script. I converted the old text files to the new format.
   * Scientist mob code was code was commented out for some reason.
        It works perfectly fine now, I don't know what was the issue with it.
   * Some refactoring for organization.
       The GUI package was in the "common" section, which is wrong, because GUIs are handled by the client.

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### TextureAnimationConverter class
As I said before the format of animation configuration is different now. So I had the idea to make a program to convert the old files to the new format. It isn't actually part of this mod, it's just a useful tool, we should remove it from the project soon. I used it to convert the animations of Technicraft, of course, It would be a lot easier and quicker to do it by hand, because we have only 5 animated textures, but where would be the fun in that? I might take the class to a separate project, make a GUI to it or something in the future. For now it's here, if someone wants to use it or do something else with it.

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### Getting back to the project
I got a lot of new ideas about this project recently. I don't know why I thought I can't do anything more when I said I'm leaving. Something must've been blocking me from coming up with new ideas. I think I'm going to implement a system for connected textures, I think I have a pretty efficient and simple way to do it in mind.