ENH: load colormaps from binaries instead of text files

[neutrinoceros]

Another startup time optimization.

I generated the binary files using the following script

import numpy as np
from pathlib import Path

DIR = Path(__file__).parent / "cmasher" / "colormaps"

for file in DIR.glob("*.txt"):
    rgb = np.genfromtxt(file, dtype=None, comments="//", encoding=None)
    np.save(file.with_suffix(".npy"), rgb, allow_pickle=False)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3a4f364) 98.64% compared to head (371a8b7) 98.67%.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #102      +/-   ##
==========================================
+ Coverage   98.64%   98.67%   +0.03%     
==========================================
  Files           5        5              
  Lines         587      600      +13     
==========================================
+ Hits          579      592      +13     
  Misses          8        8              

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