some fixes on animation import and refactoring

[codecov[bot]]

Codecov Report

Merging #125 into master will decrease coverage by 0.04%. The diff coverage is 94.64%.

@@            Coverage Diff             @@
##           master     #125      +/-   ##
==========================================
- Coverage   98.07%   98.03%   -0.05%     
==========================================
  Files          50       50              
  Lines        4058     4062       +4     
  Branches      752      754       +2     
==========================================
+ Hits         3980     3982       +2     
- Misses         35       36       +1     
- Partials       43       44       +1     

Impacted Files	Coverage Δ
io_mesh_w3d/common/utils/mesh_export.py	90.87% <0.00%> (ø)
...o_mesh_w3d/common/structs/mesh_structs/aabbtree.py	99.20% <66.66%> (ø)
io_mesh_w3d/common/utils/hierarchy_export.py	98.59% <83.33%> (ø)
io_mesh_w3d/common/structs/hlod.py	97.19% <100.00%> (ø)
io_mesh_w3d/common/structs/mesh.py	95.77% <100.00%> (ø)
io_mesh_w3d/common/structs/mesh_structs/texture.py	100.00% <100.00%> (ø)
io_mesh_w3d/common/utils/helpers.py	100.00% <100.00%> (ø)
io_mesh_w3d/common/utils/hierarchy_import.py	100.00% <100.00%> (ø)
io_mesh_w3d/common/utils/material_export.py	96.77% <100.00%> (ø)
io_mesh_w3d/common/utils/mesh_import.py	98.61% <100.00%> (ø)
... and 5 more

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