Fix editor not loading in, move Three to npm dependency

[Degubi]

My motivation behind this change is to be able to update to newer three.js versions later.

The first commit removes the usage of 'top' from editor.js, because it was causing a cross origin error which made the editor not load in.
This is a temporary fix

Second commit:

• Add three.js npm dependency
• Remove three.js files from 'media' folder (still keep editor files)
• Update three.js from r89 to r93 (last version which had a @types package before getting removed, then re-added later in r131