QuadTree implementation does not seem to be working.

When tested against the original C++ Plater library, this port fails to account for any empty space within the bounding volume within a given model.

Expected behavior

Actual behavior

Test case consisted of 3 Utah teapot models on a 300 x 300 build plate.
Each green rectangle in the image above is considered the bounding area of a teapot.

Trying to load STL files in ASCII format is currently not supported, and trying to run the scripts with such files would crash the app.

Either:

1. Add logic to distinguish between ASCII and binary formats and early exit with a "not supported" warning, or
2. Add in support for ASCII files

Add documentation for guiding installation + initial setup, as well as example usage.

Also briefly explain what each file/dir is responsible for.