Switch to compressed numpy arrays for test control data

[behackl]

List of Changes

As pointed out by @kolibril13 in #599, we should store the control data for the graphical unit tests in a compressed format. This PR switches set_up_scene and _load_data to the compressed format, and changes all control files to the compressed format.

The size of the control_data directory actually reduces from 132MB to 620KB (!!!).

Testing Status

Tests pass locally -- and this should be easy to review: either the tests pass, or they don't. 🙃

Acknowledgement

• I have read the Contributing Guidelines

[leotrs]

What a hero.

[yoshiask]

Looks good to me

[behackl]

To have this live somewhere, here is the code I used for converting the .npy files to their compressed counterparts:

import numpy as np
from pathlib import Path

p = Path(".")
control_files = [f for f in list(p.rglob("*")) if f.name[-4:] == ".npy"]

for file in control_files:
    data = np.load(file)
    np.savez_compressed(file.as_posix()[:-4], frame_data=data)

[behackl]

Docs don't only fail to build here, but apparently on master as well. This is not related to the changes here, seems we forgot to remove some PangoText somewhere. I'll have a look at that in a moment.

[naveen521kk]

Too many files to review 😂

[huguesdevimeux]

How is this miracle even possible

[kolibril13]

One method is called Huffman coding:
https://www.youtube.com/watch?v=0kNXhFIEd_w
Actually, this topic would be very suitable to make a manim video of it :D