Restructuring

[benthillerkus]

I had some ideas for making the whole thing a bit easier to install for users and to make developing add-ons for other software easier:

• Maybe there is a way to turn LilySurfaceScrapper into a module / dependency that the Blender add-on (and the Scrappers?) could import in Python?
• Another thing I thought of was moving everything into the inner LilySurfaceScrapper folder, so that the project could just be downloaded as a zip from GitHub and installed into Blender.
• The scrappers themselves could also be moved into their own repositories or gists and then be downloaded from there by the add-on. That way they can be kept updated without having to update the add-on + they are independent from both the LilySurfaceScrapper project and the Blender add-on project.