Online VTK Visualization

[cod3monk]

Online/live visualization support using vtkInterface. To install use pycachesim[ONLINE_VIS].

• When visualizing CacheSimulator show all at the same time (e.g., in multiple or different colors)
• Fix legend to tell user what is visualized

[codecov-io]

Codecov Report

Merging #5 into master will increase coverage by 0.16%.
The diff coverage is 70%.

@@            Coverage Diff             @@
##           master       #5      +/-   ##
==========================================
+ Coverage   90.17%   90.33%   +0.16%     
==========================================
  Files           4        5       +1     
  Lines         804      952     +148     
==========================================
+ Hits          725      860     +135     
- Misses         79       92      +13

Impacted Files	Coverage Δ
tests/all_tests.py	100% <ø> (ø)	⬆️
tests/vis_tests.py	100% <100%> (ø)
cachesim/cache.py	72.28% <48.93%> (+3.88%)	⬆️

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