switch to geometrybasics

[SimonDanisch]

No description provided.

[codecov]

Codecov Report

Merging #56 into master will increase coverage by 3.27%.
The diff coverage is 97.64%.

@@            Coverage Diff             @@
##           master      #56      +/-   ##
==========================================
+ Coverage   93.19%   96.47%   +3.27%     
==========================================
  Files           7        7              
  Lines         338      312      -26     
==========================================
- Hits          315      301      -14     
+ Misses         23       11      -12     

Impacted Files	Coverage Δ
src/io/2dm.jl	92.00% <91.66%> (-0.60%)	⬇️
src/io/obj.jl	92.30% <91.66%> (+9.95%)	⬆️
src/MeshIO.jl	100.00% <100.00%> (ø)
src/io/msh.jl	96.42% <100.00%> (+12.14%)	⬆️
src/io/off.jl	100.00% <100.00%> (ø)
src/io/ply.jl	100.00% <100.00%> (ø)
src/io/stl.jl	96.00% <100.00%> (-2.79%)	⬇️

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