Lineage colors agg

[michalk8]

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Title

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• New feature (non-breaking change which adds functionality)

Description

How has this been tested?

Yes. It was also previously, but it passed because it testing object also used default colors.

Closes

closes #479

[codecov]

Codecov Report

Merging #482 (a802655) into master (f501b53) will increase coverage by 0.18%.
The diff coverage is 98.13%.

@@            Coverage Diff             @@
##           master     #482      +/-   ##
==========================================
+ Coverage   88.15%   88.33%   +0.18%     
==========================================
  Files          54       53       -1     
  Lines        7360     7315      -45     
==========================================
- Hits         6488     6462      -26     
+ Misses        872      853      -19     

Flag	Coverage Δ
unittests	88.33% <98.13%> (+0.18%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
cellrank/datasets/__init__.py	100.00% <ø> (ø)
cellrank/logging/__init__.py	100.00% <ø> (ø)
cellrank/logging/_logging.py	78.72% <ø> (-0.23%)	⬇️
cellrank/pl/__init__.py	100.00% <ø> (ø)
cellrank/pl/_cluster_lineage.py	86.13% <ø> (-0.14%)	⬇️
cellrank/pl/_lineages.py	90.62% <ø> (-0.29%)	⬇️
cellrank/settings/__init__.py	100.00% <ø> (ø)
cellrank/settings/_settings.py	90.00% <ø> (ø)
cellrank/tl/__init__.py	100.00% <ø> (ø)
cellrank/tl/_constants.py	96.42% <ø> (-0.05%)	⬇️
... and 43 more

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