Add string truncate, shell_layer for plot, and several fixes

[PProfizi]

Fix default scale_factor for DataFrame.animate DataFrame.plot now treats shell_layers

[codecov[bot]]

Codecov Report

Merging #302 (bd73e70) into post_refactor (6fba0f4) will increase coverage by 0.07%. The diff coverage is 73.17%.

:exclamation: Current head bd73e70 differs from pull request most recent head 20e7799. Consider uploading reports for the commit 20e7799 to get more accurate results

@@                Coverage Diff                @@
##           post_refactor     #302      +/-   ##
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+ Coverage          82.19%   82.27%   +0.07%     
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  Files                 35       35              
  Lines               3021     3074      +53     
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+ Hits                2483     2529      +46     
- Misses               538      545       +7