Wass contributions

[WassCodeur]

Refactor animation code and fix imports [pycodestyle]

[pep8speaks]

Hello @WassCodeur, thank you for submitting the Pull Request!

• In the file fury/animation/tests/test_timeline.py:

Line 9:1: F401 'fury.window.ShowManager' imported but unused
Line 9:1: F401 'fury.window.Scene' imported but unused

To test for issues locally, pip install flake8 and then run flake8 fury.

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 84.43%. Comparing base (14851c6) to head (02c3265).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #882   +/-   ##
=======================================
  Coverage   84.43%   84.43%           
=======================================
  Files          44       44           
  Lines       10537    10537           
  Branches     1423     1423           
=======================================
  Hits         8897     8897           
  Misses       1266     1266           
  Partials      374      374           

Files	Coverage Δ
fury/animation/helpers.py	92.00% <ø> (ø)
fury/animation/timeline.py	56.52% <66.66%> (ø)
fury/animation/animation.py	68.78% <77.77%> (ø)