Оптимизация отрисовки шейпов во вьюпорте

[PavelBlend]

В версии 2.40.0 шейпы отрисовывались довольно медленно. Когда добавились полигоны для шейпов костей (#809), стало ещё медленнее. Нужно оптимизировать.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 8.66667% with 137 lines in your changes missing coverage. Please review.

Project coverage is 78.49%. Comparing base (4e06ebe) to head (4b70fbf).
Report is 15 commits behind head on develop.

Files with missing lines	Patch %	Lines
io_scene_xray/props/armature.py	8.57%	128 Missing ⚠️
io_scene_xray/props/bone.py	10.00%	9 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #810      +/-   ##
===========================================
- Coverage    78.99%   78.49%   -0.50%     
===========================================
  Files          226      226              
  Lines        21031    21181     +150     
  Branches      3512     3550      +38     
===========================================
+ Hits         16613    16626      +13     
- Misses        3518     3655     +137     
  Partials       900      900              

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