lots of minor changes

[Tarcontar]

• support for triangle surface types
• moved object custom properties to mesh custom properties
• some other stuff

[codecov[bot]]

Codecov Report

Merging #164 into master will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #164   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           49        49           
  Lines         4067      4100   +33     
  Branches       724       738   +14     
=========================================
+ Hits          4067      4100   +33     

Impacted Files	Coverage Δ
io_mesh_w3d/common/utils/hierarchy_export.py	100.00% <ø> (ø)
io_mesh_w3d/common/utils/hlod_export.py	100.00% <ø> (ø)
...w3d/common/structs/mesh_structs/shader_material.py	100.00% <100.00%> (ø)
...o_mesh_w3d/common/structs/mesh_structs/triangle.py	100.00% <100.00%> (ø)
io_mesh_w3d/common/utils/box_export.py	100.00% <100.00%> (ø)
io_mesh_w3d/common/utils/box_import.py	100.00% <100.00%> (ø)
io_mesh_w3d/common/utils/helpers.py	100.00% <100.00%> (ø)
io_mesh_w3d/common/utils/material_import.py	100.00% <100.00%> (ø)
io_mesh_w3d/common/utils/mesh_export.py	100.00% <100.00%> (ø)
io_mesh_w3d/common/utils/mesh_import.py	100.00% <100.00%> (ø)
... and 4 more

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