Feature animation interpolation

[pkulev]

Closes issue(s): [ #53 ]

Description of the changes:

• What's new:
  • Animation interpolation mechanism
  • Point multiplication and division
• Fixes:
  • Added missed check for AnimaionManager test
• Refactoring:
  • Pass args and kwargs from AnimationManager to Animation

Reviewers: [ @taptap ]

Task list:

• [x] submit pull request
• [x] review
• [x] testing
• [x] fixes after review, squashing, rebasing to master

[codecov-io]

Codecov Report

Merging #54 into master will increase coverage by 2.23%. The diff coverage is 96.87%.

@@            Coverage Diff             @@
##           master      #54      +/-   ##
==========================================
+ Coverage   59.89%   62.12%   +2.23%     
==========================================
  Files          40       40              
  Lines        1945     2057     +112     
==========================================
+ Hits         1165     1278     +113     
+ Misses        780      779       -1

Impacted Files	Coverage Δ
xoinvader/ingame.py	0% <ø> (ø)	:white_check_mark:
xoinvader/render.py	32% <ø> (ø)	:white_check_mark:
xoinvader/tests/test_animation.py	100% <100%> (ø)	:white_check_mark:
xoinvader/animation.py	100% <100%> (+1.92%)	:white_check_mark:
xoinvader/utils.py	95.62% <100%> (+0.74%)	:white_check_mark:
xoinvader/tests/test_utils.py	100% <100%> (ø)	:white_check_mark:

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