Zh export issues

[feliwir]

from now on only bones should be animated, test if changing their visibility also hides associated meshes. Also what should we do on export if a user has animated a mesh instead of its bone?

So there are multiple things we need to consider:

• Hierarchical model is exported but there exists no armature --> I think then it would make sense to autogenerate the hierarchy as we did before. Not required right now, not sure what would be the best behaviour here.
• As you said: There exists an armature, but the mesh is animated instead of the bones --> Ignore the mesh animation and maybe show a warning.

Maybe we should get some user opinions

[codecov[bot]]

Codecov Report

Merging #142 into master will increase coverage by 0.06%. The diff coverage is 99.05%.

@@            Coverage Diff             @@
##           master     #142      +/-   ##
==========================================
+ Coverage   97.95%   98.01%   +0.06%     
==========================================
  Files          49       49              
  Lines        4099     4075      -24     
  Branches      757      740      -17     
==========================================
- Hits         4015     3994      -21     
+ Misses         37       36       -1     
+ Partials       47       45       -2     

Impacted Files	Coverage Δ
io_mesh_w3d/custom_properties.py	100.00% <ø> (ø)
io_mesh_w3d/common/utils/mesh_export.py	90.80% <96.15%> (+0.38%)	:arrow_up:
io_mesh_w3d/common/structs/animation.py	96.29% <100.00%> (ø)
io_mesh_w3d/common/structs/hierarchy.py	96.69% <100.00%> (-0.03%)	:arrow_down:
io_mesh_w3d/common/structs/hlod.py	97.22% <100.00%> (ø)
io_mesh_w3d/common/structs/mesh.py	95.79% <100.00%> (-0.03%)	:arrow_down:
io_mesh_w3d/common/utils/animation_export.py	96.59% <100.00%> (ø)
io_mesh_w3d/common/utils/animation_import.py	97.33% <100.00%> (-1.41%)	:arrow_down:
io_mesh_w3d/common/utils/box_import.py	100.00% <100.00%> (+6.45%)	:arrow_up:
io_mesh_w3d/common/utils/helpers.py	100.00% <100.00%> (ø)
... and 11 more

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