use armature name if exists

[Tarcontar]

• format floats to 6 decimal places
• use armature name as hierarchy id if existing
• fix missing includes

[codecov[bot]]

Codecov Report

Merging #115 into master will decrease coverage by 0.18%. The diff coverage is 98.46%.

@@            Coverage Diff            @@
##           master    #115      +/-   ##
=========================================
- Coverage   97.39%   97.2%   -0.19%     
=========================================
  Files          50      50              
  Lines        4032    4046      +14     
  Branches      754     758       +4     
=========================================
+ Hits         3927    3933       +6     
- Misses         46      52       +6     
- Partials       59      61       +2

Impacted Files	Coverage Δ
io_mesh_w3d/w3d/export_w3d.py	100% <ø> (ø)	:arrow_up:
io_mesh_w3d/w3x/io_xml.py	100% <100%> (ø)	:arrow_up:
io_mesh_w3d/w3x/export_w3x.py	98.75% <97.61%> (-1.25%)	:arrow_down:
io_mesh_w3d/w3x/import_w3x.py	85.33% <0%> (-9.34%)	:arrow_down:

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