fix(lib): Manim fixes, bump to >= 0.18, and tests

[jeertmans]

This PR bumps Manim to >= 0.18 because it is a pain to have to support both the old colors and the new color system.

Tests are also refactored so that they actually test for ManimGL and OpenGL renderers too.

TODO:

• Add in the docs a note about ManimGL and ManimCE be installable altogether (because manimpango and NumPy)
• Also, ManimGL extra is not available on Python >= 3.12, because it is broken with Numpy > 1.24
• Finish cleaning tests

Unfortunately, Rye uses an outdated version of uv, and we need to have at least uv>=0.2.6 to support the dependency overrides.

Closes #431

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.37%. Comparing base (5924c32) to head (50faf16).
Report is 30 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #447      +/-   ##
==========================================
+ Coverage   79.24%   80.37%   +1.13%     
==========================================
  Files          22       22              
  Lines        1816     1824       +8     
==========================================
+ Hits         1439     1466      +27     
+ Misses        377      358      -19     

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