Fix groove sel vis export

[marscher]

This fixes two bugs in the visualization of the groove selection widget. The k3d plot needs to be displayed within the ipywidgets.Output capturing context. Secondly the STL export for a simple VGroove encountered a division by zero error. So for now this format is disallowed, and only PLY can be exported.

[codecov[bot]]

Codecov Report

Merging #46 (24022f6) into main (0c10c5e) will increase coverage by 1.16%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #46      +/-   ##
==========================================
+ Coverage   71.79%   72.95%   +1.16%     
==========================================
  Files          24       23       -1     
  Lines        1560     1553       -7     
==========================================
+ Hits         1120     1133      +13     
+ Misses        440      420      -20     

Impacted Files	Coverage Δ
weldx_widgets/tests/test_groove_sel.py	100.00% <100.00%> (ø)
weldx_widgets/visualization/csm_k3d.py	87.74% <100.00%> (+1.03%)	:arrow_up:
weldx_widgets/widget_groove_sel.py	93.41% <100.00%> (+3.25%)	:arrow_up:

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[CagtayFabry]

thanks, for some reason the 0 division exception even popped up without creating a file when switching to the 3d view tab, is that fixed as well?